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Motorcycle
A post-2022 model of the Kawasaki Ninja 400
ClassificationVehicle
ApplicationTransportation
Fuel source
PoweredYes
Self-propelledYes
Wheels2 (rarely 3 or 4)
InventorGottlieb Daimler
Invented1885

A motorcycle (motorbike, bike, or, if three-wheeled, a trike) is a two or three-wheeled motor vehicle steered by a handlebar from a saddle-style seat.[1][2][3]

Motorcycle designs vary greatly to suit a range of different purposes: long-distance travel, commuting, cruising, sport (including racing), and off-road riding. Motorcycling is riding a motorcycle and being involved in other related social activities such as joining a motorcycle club and attending motorcycle rallies.

The 1885 Daimler Reitwagen made by Gottlieb Daimler and Wilhelm Maybach in Germany was the first internal combustion petroleum-fueled motorcycle. In 1894, Hildebrand & Wolfmüller became the first series production motorcycle.[4][5]

Globally, motorcycles are comparable numerically to cars as a method of transport: in 2021, approximately 58.6 million new motorcycles were sold around the world, while 66.7 million cars were sold over the same period.[6]

In 2022, the top four motorcycle producers by volume and type were Honda, Yamaha, Kawasaki, and Suzuki. According to the US Department of Transportation, the number of fatalities per vehicle mile traveled was 37 times higher for motorcycles than for cars.[7]

Types

[edit]
Main article: Types of motorcycles

The term motorcycle has different legal definitions depending on jurisdiction (see § Legal definitions and restrictions).

There are three major types of motorcycle: street, off-road, and dual purpose. Within these types, there are many sub-types of motorcycles for different purposes. There is often a racing counterpart to each type, such as road racing and street bikes, or motocross including dirt bikes.

Street bikes include cruisers, sportbikes, scooters and mopeds, and many other types. Off-road motorcycles include many types designed for dirt-oriented racing classes such as motocross and are not street legal in most areas. Dual purpose machines like the dual-sport style are made to go off-road but include features to make them legal and comfortable on the street as well.

Each configuration offers either specialised advantage or broad capability, and each design creates a different riding posture.

In some countries the use of pillions (rear seats) is restricted.

History

[edit]
Main article: History of the motorcycle

Experimentation and invention

[edit]
Replica of the Daimler-Maybach Reitwagen

The first internal combustion, petroleum fueled motorcycle was the Daimler Reitwagen. It was designed and built by the German inventors Gottlieb Daimler and Wilhelm Maybach in Bad Cannstatt, Germany, in 1885.[8] This vehicle was unlike either the safety bicycles or the boneshaker bicycles of the era in that it had zero degrees of steering axis angle and no fork offset, and thus did not use the principles of bicycle and motorcycle dynamics developed nearly 70 years earlier. Instead, it relied on two outrigger wheels to remain upright while turning.[9]

The inventors called their invention the Reitwagen ("riding car"). It was designed as an expedient testbed for their new engine, rather than a true prototype vehicle.[10][11]

Butler's Patent Velocycle

The first commercial design for a self-propelled cycle was a three-wheel design called the Butler Petrol Cycle, conceived of Edward Butler in England in 1884.[12] He exhibited his plans for the vehicle at the Stanley Cycle Show in London in 1884. The vehicle was built by the Merryweather Fire Engine company in Greenwich, in 1888.[13]

The Butler Petrol Cycle was a three-wheeled vehicle, with the rear wheel directly driven by a 5⁄8 hp (0.47 kW), 40 cc (2.4 cu in) displacement, 2+1⁄4 in × 5 in (57 mm × 127 mm) bore × stroke, flat twin four-stroke engine (with magneto ignition replaced by coil and battery) equipped with rotary valves and a float-fed carburettor (five years before Maybach) and Ackermann steering, all of which were state of the art at the time. Starting was by compressed air. The engine was liquid-cooled, with a radiator over the rear driving wheel. Speed was controlled by means of a throttle valve lever. No braking system was fitted; the vehicle was stopped by raising and lowering the rear driving wheel using a foot-operated lever; the weight of the machine was then borne by two small castor wheels. The driver was seated between the front wheels. It was not, however, a success, as Butler failed to find sufficient financial backing.[14]

Many authorities have excluded steam powered, electric motorcycles or diesel-powered two-wheelers from the definition of a 'motorcycle', and credit the Daimler Reitwagen as the world's first motorcycle.[15][16][17] Given the rapid rise in use of electric motorcycles worldwide,[18] defining only internal-combustion powered two-wheelers as 'motorcycles' is increasingly problematic. The first (petroleum fueled) internal-combustion motorcycles, like the German Reitwagen, were, however, also the first practical motorcycles.[16][19][20]

If a two-wheeled vehicle with steam propulsion is considered a motorcycle, then the first motorcycles built seem to be the French Michaux-Perreaux steam velocipede which patent application was filed in December 1868,[10][11] constructed around the same time as the American Roper steam velocipede, built by Sylvester H. Roper of Roxbury, Massachusetts,[10][11] who had been demonstrating his machine at fairs and circuses in the eastern U.S. since 1867.[8] Roper built about 10 steam cars and cycles from the 1860s until his death in 1896.[17]

Summary of early inventions

[edit]
Year Vehicle Number of wheels Inventor Engine type Notes
1867–1868 Michaux-Perreaux steam velocipede 2 Pierre Michaux
Louis-Guillaume Perreaux		 Steam
  • One made
1867–1868 Roper steam velocipede 2 Sylvester Roper Steam
  • One made
1885 Daimler Reitwagen 2 (plus 2 outriggers) Gottlieb Daimler
Wilhelm Maybach		 Petroleum internal-combustion
  • One made
1887 Butler Petrol Cycle 3 (plus 2 castors) Edward Butler Petroleum internal-combustion
1894 Hildebrand & Wolfmüller 2 Heinrich Hildebrand
Wilhelm Hildebrand
Alois Wolfmüller		 Petroleum internal-combustion
  • Modern configuration
  • First mass-produced motorcycle
  • First machine to be called "motorcycle"

First motorcycle companies

[edit]
Diagram of 1894 Hildebrand & Wolfmüller

In 1894, Hildebrand & Wolfmüller became the first series production motorcycle, and the first to be called a motorcycle (German: Motorrad).[10][11][17][21] Excelsior Motor Company, originally a bicycle manufacturing company based in Coventry, England, began production of their first motorcycle model in 1896.

The first production motorcycle in the US was the Orient-Aster, built by Charles Metz in 1898 at his factory in Waltham, Massachusetts.

In the early period of motorcycle history, many producers of bicycles adapted their designs to accommodate the new internal combustion engine. As the engines became more powerful and designs outgrew the bicycle origins, the number of motorcycle producers increased. Many of the nineteenth-century inventors who worked on early motorcycles often moved on to other inventions. Daimler and Roper, for example, both went on to develop automobiles.

1902 Orient motocycle

At the end of the 19th century the first major mass-production firms were set up. In 1898, Triumph Motorcycles in England began producing motorbikes, and by 1903 it was producing over 500 bikes. Other British firms were Royal Enfield, Norton, Douglas Motorcycles and Birmingham Small Arms Company who began motorbike production in 1899, 1902, 1907 and 1910, respectively.[22] Indian began production in 1901 and Harley-Davidson was established two years later. By the outbreak of World War I, the largest motorcycle manufacturer in the world was Indian,[23][24] producing over 20,000 bikes per year.[25]

First World War

[edit]

During the First World War, motorbike production was greatly ramped up for the war effort to supply effective communications with front line troops. Messengers on horses were replaced with despatch riders on motorcycles carrying messages, performing reconnaissance and acting as a military police. American company Harley-Davidson was devoting over 50% of its factory output toward military contract by the end of the war. The British company Triumph Motorcycles sold more than 30,000 of its Triumph Type H model to allied forces during the war. With the rear wheel driven by a belt, the Model H was fitted with a 499 cc (30.5 cu in) air-cooled four-stroke single-cylinder engine. It was also the first Triumph without pedals.[26][better source needed]

The Model H in particular, is regarded by many as having been the first "modern motorcycle".[27] Introduced in 1915 it had a 550 cc side-valve four-stroke engine with a three-speed gearbox and belt transmission. It was so popular with its users that it was nicknamed the "Trusty Triumph".[28]

Postwar

[edit]
Motorcycle rider on his Rudge-Whitworth motorbike, Australia, c. 1935

By 1920, Harley-Davidson was the largest manufacturer,[29] with their motorcycles being sold by dealers in 67 countries.[30][31]

Amongst many British motorcycle manufacturers, Chater-Lea with its twin-cylinder models followed by its large singles in the 1920s stood out. Initially, using converted a Woodmann-designed OHV Blackburne engine it became the first 350 cc to exceed 100 mph (160 km/h), recording 100.81 mph (162.24 km/h) over the flying kilometre during April 1924.[7] Later, Chater-Lea set a world record for the flying kilometre for 350 cc and 500 cc motorcycles at 102.9 mph (165.6 km/h) for the firm. Chater-Lea produced variants of these world-beating sports models and became popular among racers at the Isle of Man TT. Today, the firm is probably best remembered for its long-term contract to manufacture and supply AA Patrol motorcycles and sidecars.[citation needed]

By the late 1920s or early 1930s, DKW in Germany took over as the largest manufacturer.[32][33][34]

NSU Sportmax streamlined motorcycle, 250 cc class winner of the 1955 Grand Prix season

In the 1950s, streamlining began to play an increasing part in the development of racing motorcycles and the "dustbin fairing" held out the possibility of radical changes to motorcycle design. NSU and Moto Guzzi were in the vanguard of this development, both producing very radical designs well ahead of their time.[35] NSU produced the most advanced design, but after the deaths of four NSU riders in the 1954–1956 seasons, they abandoned further development and quit Grand Prix motorcycle racing.[36]

Moto Guzzi produced competitive race machines, and until the end of 1957 had a succession of victories.[37] The following year, 1958, full enclosure fairings were banned from racing by the FIM in the light of the safety concerns.

From the 1960s through the 1990s, small two-stroke motorcycles were popular worldwide, partly as a result of East German MZs Walter Kaaden's engine work in the 1950s.[38]

Today

[edit]
Royal Enfield Bullet

In the 21st century, the motorcycle industry is mainly dominated by Indian and Japanese motorcycle companies. In addition to the large capacity motorcycles, there is a large market in smaller capacity (less than 300 cc) motorcycles, mostly concentrated in Asian and African countries and produced in China and India.[citation needed] A Japanese example is the 1958 Honda Super Cub, which went on to become the biggest selling vehicle of all time, with its 60 millionth unit produced in April 2008.[39] Today, this area is dominated by mostly Indian companies with Hero MotoCorp emerging as the world's largest manufacturer of two wheelers. Its Splendor model has sold more than 8.5 million to date.[40] Other major producers are Bajaj and TVS Motors.[41]

Yamaha Troops motorbike

Technical aspects

[edit]
A Suzuki GS500 with a clearly visible frame, painted silver

Construction

[edit]
See also: Motorcycle components and Motorcycle design

Motorcycle construction is the engineering, manufacturing, and assembly of components and systems for a motorcycle which results in the performance, cost, and aesthetics desired by the designer. With some exceptions, construction of modern mass-produced motorcycles has standardised on a steel or aluminium frame, telescopic forks holding the front wheel, and disc brakes. Some other body parts, designed for either aesthetic or performance reasons may be added. A petrol-powered engine typically consisting of between one and four cylinders (and less commonly, up to eight cylinders) coupled to a manual five- or six-speed sequential transmission drives the swingarm-mounted rear wheel by a chain, driveshaft, or belt. The repair can be done using a motorcycle lift.

Fuel economy

[edit]

Motorcycle fuel economy varies greatly with engine displacement and riding style. A streamlined, fully faired Matzu Matsuzawa Honda XL125 achieved 470 mpg‑US (0.50 L/100 km; 560 mpg‑imp) in the Craig Vetter Fuel Economy Challenge "on real highways – in real conditions".[42] Due to low engine displacements (100–200 cc (6.1–12.2 cu in)), and high power-to-mass ratios, motorcycles offer good fuel economy. Under conditions of fuel scarcity like 1950s Britain and modern developing nations, motorcycles claim large shares of the vehicle market. In the United States, the average motorcycle fuel economy is 44 miles per US gallon (19 km per liter).[43]

Electric motorcycles

[edit]
Main article: Electric motorcycles and scooters

Very high fuel economy equivalents are often derived by electric motorcycles. Electric motorcycles are nearly silent, zero-emission electric motor-driven vehicles. Operating range and top speed are limited by battery technology.[44] Fuel cells and petroleum-electric hybrids are also under development to extend the range and improve performance of the electric drive system.

Reliability

[edit]

A 2013 survey of 4,424 readers of the US Consumer Reports magazine collected reliability data on 4,680 motorcycles purchased new from 2009 to 2012.[45] The most common problem areas were accessories, brakes, electrical (including starters, charging, ignition), and fuel systems, and the types of motorcycles with the greatest problems were touring, off-road/dual sport, sport-touring, and cruisers.[45] There were not enough sport bikes in the survey for a statistically significant conclusion, though the data hinted at reliability as good as cruisers.[45] These results may be partially explained by accessories including such equipment as fairings, luggage, and auxiliary lighting, which are frequently added to touring, adventure touring/dual sport and sport touring bikes.[46] Trouble with fuel systems is often the result of improper winter storage, and brake problems may also be due to poor maintenance.[45] Of the five brands with enough data to draw conclusions, Honda, Kawasaki and Yamaha were statistically tied, with 11 to 14% of those bikes in the survey experiencing major repairs.[45] Harley-Davidsons had a rate of 24%, while BMWs did worse, with 30% of those needing major repairs.[45] There were not enough Triumph and Suzuki motorcycles surveyed for a statistically sound conclusion, though it appeared Suzukis were as reliable as the other three Japanese brands while Triumphs were comparable to Harley-Davidson and BMW.[45] Three-fourths of the repairs in the survey cost less than US$200 and two-thirds of the motorcycles were repaired in less than two days.[45] In spite of their relatively worse reliability in this survey, Harley-Davidson and BMW owners showed the greatest owner satisfaction, and three-fourths of them said they would buy the same bike again, followed by 72% of Honda owners and 60 to 63% of Kawasaki and Yamaha owners.[45]

Dynamics

[edit]
Racing motorcycles leaning in a turn
Main article: Bicycle and motorcycle dynamics

Two-wheeled motorcycles stay upright while rolling due to a physical property known as conservation of angular momentum in the wheels. Angular momentum points along the axle, and it "wants" to stay pointing in that direction.

Different types of motorcycles have different dynamics and these play a role in how a motorcycle performs in given conditions. For example, one with a longer wheelbase provides the feeling of more stability by responding less to disturbances.[47] Motorcycle tyres have a large influence over handling.

Motorcycles must be leaned in order to make turns. This lean is induced by the method known as countersteering, in which the rider momentarily steers the handlebars in the direction opposite of the desired turn. This practice is counterintuitive and therefore often confusing to novices – and even many experienced motorcyclists.[48][49][50]

With such short wheelbase, motorcycles can generate enough torque at the rear wheel, and enough stopping force at the front wheel, to lift the opposite wheel off the road. These actions, if performed on purpose, are known as wheelies and stoppies (or endos) respectively.

Accessories

[edit]
Main article: Motorcycle accessories

Various features and accessories may be attached to a motorcycle either as OEM (factory-fitted) or aftermarket. Such accessories are selected by the owner to enhance the motorcycle's appearance, safety, performance, or comfort, and may include anything from mobile electronics to sidecars and trailers.

Records

[edit]

Safety

[edit]
Motorcycle equipment
Main articles: Motorcycle safety and Motorcycle safety clothing
Wearing a motorcycle helmet (which is a legal requirement in many countries) reduces the risks of death or head injury in a motorcycle crash.

Motorcycles have a higher rate of fatal accidents than automobiles or trucks and buses. United States Department of Transportation data for 2005 from the Fatality Analysis Reporting System show that for passenger cars, 18.62 fatal crashes occur per 100,000 registered vehicles. For motorcycles this figure is 75.19 per 100,000 registered vehicles – four times higher than for cars.[53] The same data shows that 1.56 fatalities occur per 100 million vehicle miles travelled for passenger cars, whereas for motorcycles the figure is 43.47 which is 28 times higher than for cars (37 times more deaths per mile travelled in 2007).[7] Motorcycle accident rates have increased significantly since the end of the 1990s, while the rates have dropped for passenger cars.

The most common scenario for motorcycle accidents in the United States is a motorist pulling out or turning in front of a motorcyclist, violating their right-of-way.[54] This is sometimes called a SMIDSY, an acronym for the motorists' common response of "Sorry mate, I didn't see you".[55] Motorcyclists can anticipate and avoid some of these crashes with proper training, increasing their visibility to other traffic, keeping to the speed limits, and not consuming alcohol or other drugs before riding.[56]

The United Kingdom has several organisations dedicated to improving motorcycle safety by providing advanced rider training beyond what is necessary to pass the basic motorcycle licence test. These include the Institute of Advanced Motorists (IAM) and the Royal Society for the Prevention of Accidents (RoSPA). Along with increased personal safety, riders with these advanced qualifications may benefit from reduced insurance costs.[57]

In South Africa, the Think Bike campaign is dedicated to increasing both motorcycle safety and the awareness of motorcycles on the country's roads. The campaign, while strongest in the Gauteng province, has representation in Western Cape, KwaZulu Natal and the Free State. It has dozens of trained marshals available for various events such as cycle races and is deeply involved in numerous other projects such as the annual Motorcycle Toy Run.[58]

Motorcycle safety education is offered throughout the United States by organisations including state agencies, non-profit organisations, and corporations. Most states use the courses designed by the Motorcycle Safety Foundation (MSF), while Oregon and Idaho developed their own. All of the training programs include a Basic Rider Course, an Intermediate Rider Course and an Advanced Rider Course.

An MSF rider course for novices

In Ireland, since 2010,[59] in the UK and some Australian jurisdictions, such as Victoria, New South Wales,[60] the Australian Capital Territory,[61] Tasmania[62] and the Northern Territory,[63] it is compulsory to complete a basic rider training course before being issued a Learners Licence, after which they can ride on public roads.

In Canada, motorcycle rider training is compulsory in Quebec and Manitoba only, but all provinces and territories have graduated licence programs which place restrictions on new drivers until they have gained experience. Eligibility for a full motorcycle licence or endorsement for completing a Motorcycle Safety course varies by province. Without the Motorcycle Safety Course the chance of getting insurance for the motorcycle is very low. The Canada Safety Council, a non-profit safety organisation, offers the Gearing Up program across Canada and is endorsed by the Motorcycle and Moped Industry Council.[64] Training course graduates may qualify for reduced insurance premiums.

Motorcyclists and motor scooter riders are also exposed to an increased risk of suffering hearing damage such as hearing loss and tinnitus (ringing ears).[65][66] The noise is caused by wind noise while riding, rolling noise from the tyres and the engine itself.[67] The helmet only provides insufficient protection against high sound pressure levels.[68] Medicine (as of 2024) is not able to cure hearing damage. Wearing hearing protection, such as special earplugs for motorcyclists, can help prevent hearing damage.

Motorcycle rider postures

[edit]
BMW C1, with a more upright seating position
Bombardier Can-Am Spyder, showing location of rider on the trike

The motorcyclist's riding position depends on rider body-geometry (anthropometry) combined with the geometry of the motorcycle itself. These factors create a set of three basic postures.[69]

  • Sport – the rider leans forward into the wind and the weight of the upper torso is supported by the rider's core at low speed and air pressure at high speed.[70] The footpegs are below the rider or to the rear. The reduced frontal area cuts wind resistance and allows higher speeds. At low-speed in this position the rider's arms may bear some of the weight of the rider's torso, which can be problematic.
  • Standard – the rider sits upright or leans forward slightly. The feet are below the rider. These are motorcycles that are not specialised to one task, so they do not excel in any particular area.[71][72] The standard posture is used with touring and commuting as well as dirt and dual-sport bikes, and may offer advantages for beginners.[73]
  • Cruiser – the rider sits at a lower seat height with the upper torso upright or leaning slightly rearward. Legs are extended forwards, sometimes out of reach of the regular controls on cruiser pegs. The low seat height can be a consideration for new or short riders. Handlebars tend to be high and wide. The emphasis is on comfort while compromising cornering ability because of low ground clearance and the greater likelihood of scraping foot pegs, floor boards, or other parts if turns are taken at the speeds other motorcycles can more readily accomplish.[74][75]

Factors of a motorcycle's ergonomic geometry that determine the seating posture include the height, angle and location of footpegs, seat and handlebars. Factors in a rider's physical geometry that contribute to seating posture include torso, arm, thigh and leg length, and overall rider height.

Customized styles and subcultures

[edit]
See also: Custom motorcycle

While motorcycles are manufactured in standard styles (sport, cruiser, enduro, etc...), certain styles of motorcycle sub-genres have been both independently created, or manufactured in accordance with a pre-existing cultural style. Styles of note include: Café racers, Choppers, and Streetfighters.[76]

Cultural influence has directly led to the manufacturing of certain styles of motorcycles such as the Café racer. The stylistic choices and aerodynamic benefits of these custom bikes garnered a tremendous popularity which lead manufacturers to adopt the visual cues, and attempt to mimic the custom builds of these motorcycles. Notably, Harley-Davidson also leaned into a popular custom motorcycle culture (the Chopper), producing the Harley "soft-tail". This design attempted to appear as a hard tail chopper style build, while maintaining rear suspension yet having an aggressive riding angle similar to that of the custom builds.[77]

[edit]
Main article: Legal definition of motorcycle

A motorcycle is broadly defined by law in most countries for the purposes of registration, taxation and rider licensing as a powered two-wheel motor vehicle. Most countries distinguish between mopeds of 49 cc and the more powerful, larger vehicles, including scooter type motorcycles.[78] Many jurisdictions include some forms of three-wheeled cars as motorcycles.

In Nigeria, motorcycles, popularly referred to as Okada have been subject of many controversies with regards to safety and security followed by restriction of movement in many states. In 2020, it was banned in Lagos, Nigeria's most populous city.[79][80]

In Iran, women are not allowed to ride motorcycles.[81]

Environmental impact

[edit]

Motorcycles and scooters' low fuel consumption has attracted interest in the United States from environmentalists and those affected by increased fuel prices.[82][83] Piaggio Group Americas supported this interest with the launch of a "Vespanomics" website and platform, claiming lower per-mile carbon emissions of 0.4 lb/mile (113 g/km) less than the average car, a 65% reduction, and better fuel economy.[84]

However, a motorcycle's exhaust emissions may contain 10–20 times more oxides of nitrogen (NOx), carbon monoxide, and unburned hydrocarbons than exhaust from a similar-year passenger car or SUV.[82][85] This is because many motorcycles lack a catalytic converter, and the emission standard is much more permissive for motorcycles than for other vehicles.[82] While catalytic converters have been installed in most gasoline-powered cars and trucks since 1975 in the United States, they can present fitment and heat difficulties in motorcycle applications.[82] [better source needed]

United States Environmental Protection Agency 2007 certification result reports for all vehicles versus on highway motorcycles (which also includes scooters),[86] the average certified emissions level for 12,327 vehicles tested was 0.734. The average "Nox+Co End-Of-Useful-Life-Emissions" for 3,863 motorcycles tested was 0.8531. 54% of the tested 2007-model motorcycles were equipped with a catalytic converter.

United States emissions limits

[edit]

The following table shows maximum acceptable legal emissions of the combination of hydrocarbons, oxides of nitrogen, and carbon monoxide for new motorcycles sold in the United States with 280 cc or greater piston displacement.[87]

Tier Model year HC+NOx (g/km) CO (g/km)
Tier 1 2006–2009 1.4 12.0
Tier 2 2010 and later 0.8 12.0

The maximum acceptable legal emissions of hydrocarbon and carbon monoxide for new Class I and II motorcycles (50 cc–169 cc and 170 cc–279 cc respectively) sold in the United States are as follows:[87]

Model year HC (g/km) CO (g/km)
2006 and later 1.0 12.0

Europe

[edit]

European emission standards for motorcycles are similar to those for cars.[88] New motorcycles must meet Euro 5 standards,[89] while cars must meet Euro 6D-temp standards. Motorcycle emission controls are being updated and it has been proposed to update to Euro 5+ in 2024.[90]

Asia

[edit]

In Asia, motorcycles are a common mode of transportation and are putting significant pressure on the region's environment.[91][92] With a massive number of motorcycles, they contribute significantly to greenhouse gas emissions and urban air pollution.[92][93] In India, road transport accounts for about 12% of the country's energy-related CO2 emissions.[94] In Vietnam, motorcycles contribute up to 87% of the CO emissions and 94% of hydrocarbons (HC) released by vehicles in Hanoi and Ho Chi Minh City.[95][96][97] Environmental studies show that motorcycles in Vietnam contribute approximately 29% of NOx, 90% of CO, 65% of NMVOC, and nearly 38% of PM dust in total traffic emissions.[98][99][100] In Thailand, gasoline-powered motorcycles are reported to emit significantly higher pollution per kilometer compared to gasoline-powered cars, exacerbating urban smog.[101][102] In Singapore, the NEA reported that while motorcycles account for only 15 percent of vehicles, they contribute to over 53 percent of carbon monoxide emissions from vehicles.[103][104]

See also

[edit]

References

[edit]

General references

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Motorcycle

View on Grokipedia
from Grokipedia
A motorcycle is a motor vehicle with motive power having a seat or saddle for the use of the rider and designed to travel on not more than three wheels in contact with the ground. These vehicles typically feature a frame supporting an engine—historically an internal combustion type, though electric propulsion has gained traction—and are balanced dynamically by the rider's body weight during operation. Originating from 19th-century bicycle designs, motorcycles enable agile personal transport, often outperforming automobiles in maneuverability and fuel efficiency per passenger but exposing riders to greater vulnerability in collisions due to minimal protective structure. The first gasoline-powered motorcycle prototype, known as the , emerged in 1885 from German engineers and , marking a shift from or pedal-assisted precursors toward self-propelled two-wheelers. Early models prioritized simplicity and speed over comfort, evolving through the into mass-produced variants that fueled military applications in both world wars and post-war consumer booms, particularly in and . By the , advancements in , materials, and electronics have diversified motorcycles into specialized forms, including high-performance machines capable of exceeding and rugged off-road models for unpaved terrain. Motorcycles serve diverse roles, from urban commuting and long-distance touring to competitive sports and recreational , with common categories encompassing standards for everyday versatility, cruisers for relaxed highway postures, sport bikes for track-derived agility, and dual-sport variants blending on- and off-road capabilities. Globally, the industry generated approximately USD 72 billion in revenue in 2024, driven by demand in developing markets for affordable mobility amid and , though adoption in wealthier nations emphasizes and performance. Despite their efficiency—offering up to 50-100 miles per gallon in many models—motorcycles carry elevated risks, accounting for nearly 30% of road crash fatalities worldwide despite comprising a fraction of vehicles, primarily due to instability, visibility challenges, and impact severity without enclosing cabins.

Definition and Classification

Core Definition and Operating Principles

A motorcycle is a two- or three-wheeled self-propelled motor vehicle engineered for transporting one or two riders in a saddle-style seated position, with steering controlled via a handlebar. Unlike four-wheeled automobiles, its design emphasizes lightweight construction, minimal ground contact via the wheels, and direct exposure of the rider to environmental forces, enabling high maneuverability but requiring active control for stability. Propulsion originates from an onboard power source—traditionally a reciprocating internal combustion engine displacing 50 to 2000 cubic centimeters, though electric motors producing equivalent torque via battery packs are now viable alternatives—delivering rotational force to the rear wheel through a drivetrain such as a chain, belt, or shaft. The core operating principles hinge on dynamic equilibrium between gravitational, centrifugal, and frictional forces, governed by Newtonian mechanics and vehicle geometry. Balance at rest or low speeds (<10 km/h) relies on the rider's proprioceptive adjustments, shifting body weight laterally while using the clutch and throttle to inch forward, akin to unicycle control; failure to do so results in toppling due to the high center of gravity, typically 0.5 to 0.7 meters above ground. At speeds above 20 km/h, inherent stability emerges from the front fork's caster angle (rake, usually 25-30 degrees) and offset, creating positive trail (80-120 mm) that generates a self-righting torque via camber thrust and scrubbing torques when disturbed. Gyroscopic precession of the rotating wheels (front wheel angular velocity often exceeding 100 rad/s at highway speeds) further resists weave and wobble modes, with empirical studies confirming these effects dominate over rider mass distribution for speeds up to 100 km/h on straight paths. Steering and turning invoke as the primary mechanism: to initiate a right turn, the rider momentarily pushes the left handlebar forward (or pulls the right), torquing the front leftward and inducing a rightward lean via equilibrium and roll due to the contact patch's lateral shift. This lean angle θ satisfies tan(θ) ≈ v²/(g r), where v is , g is (9.81 m/s²), and r is turn radius, balancing with gravitational for without slipping ( coefficient μ typically 0.7-1.0 for road tires). Once leaned, modulation and minor corrections sustain the arc, with braking distributed across front (70% of from caliper/disc systems) and rear wheels to avoid lockup and maintain traction. These principles, derived from rigid-body dynamics models validated against instrumented prototypes, underscore why motorcycles demand skilled rider input over passive stability found in automobiles. The term "motorcycle" is a portmanteau formed in 1895 from "motor," derived from Latin motor ("mover" or "that which imparts motion"), and "cycle," from Greek kyklos ("circle" or "wheel"), denoting a pedal-less augmented with motorized . This arose amid early experiments small internal engines onto frames in the , emphasizing the vehicle's wheeled, two-wheeled heritage over pure engine-driven autonomy. In German, the equivalent "Motorrad" ("motor wheel") first appeared in 1894 with the Hildebrand & Wolfmüller, the earliest series-produced gasoline-powered two-wheeler, marking a parallel linguistic evolution in . Legal classifications of motorcycles diverge by but converge on core attributes: self-propelled, two- or three-wheeled vehicles with a saddle-style for the rider, handlebar , and no enclosing cabin, distinguishing them from automobiles or bicycles. In the United States, federal standards from the (NHTSA) define a motorcycle as "a with motive power having a or saddle for the use of the rider and designed to travel on not more than three wheels in contact with the ground," explicitly excluding tractors and vehicles requiring pedals for operation. Environmental Protection Agency regulations further specify motorcycles as having two or three wheels and a curb mass of 680 kilograms (1,499 pounds) or less, facilitating uniform emissions and safety testing. State-level U.S. laws mirror this, as in California where a motorcycle is any motor vehicle with a rider's seat or saddle, engineered for not more than three wheels on the ground, mandating specific operator licensing, registration, and equipment like mirrors and headlights. Key differentiations from mopeds and scooters center on power output, speed capability, and pedals: mopeds typically feature engines of 50 cubic centimeters or smaller, top speeds under 30 miles per hour, and often pedals, allowing operation under car licenses in many states without full motorcycle endorsement. Scooters with enclosed engines exceeding 50 cc and higher speeds generally fall under motorcycle classification, requiring motorcycle-specific helmets, insurance, and endorsements, though some jurisdictions group low-power scooters with mopeds for lighter regulation. These criteria influence taxation, road access, and safety mandates, with motorcycles often facing stricter scrutiny due to higher crash risks from exposure and maneuverability demands.

Primary Types and Variants

Motorcycles are classified primarily by , intended purpose, and riding , with categories reflecting trade-offs between speed, comfort, versatility, and capability. Common delineations include street-oriented models for paved roads, dual-purpose bikes for mixed on- and off-road use, and off-highway variants optimized for dirt or track environments. This segmentation arises from engineering priorities: aerodynamic fairings and aggressive postures prioritize handling and velocity in models, while relaxed seating and ample storage favor endurance in touring designs. Sportbikes emphasize high-performance components such as lightweight frames, powerful inline-four engines exceeding 100 horsepower in supersport variants, and clip-on handlebars for forward-leaning positions that reduce wind resistance during track or canyon riding. These machines achieve top speeds over 180 mph in production models like the , but demand skilled operation due to reduced stability at low speeds. Cruisers, by contrast, feature low-slung seats, extended forward controls, and V-twin engines tuned for low-end , enabling relaxed highway cruising at speeds around 70-90 mph with a focus on stylistic evocation of 1940s American designs. Touring motorcycles integrate windshields, saddlebags, and adjustable suspensions for long-distance , often with engines in the 1,000-1,800 cc range providing smooth power delivery for sustained interstate use; examples include models capable of 500+ mile days with passenger accommodations. Adventure bikes combine tall suspensions, knobby tires, and robust frames for gravel and pavement duality, typically displacing 800-1,300 cc to balance weight and off-road prowess, as seen in the R 1250 GS which offers adjustable electronic aids for varied terrains. Dual-sport variants, a lighter subset, prioritize street legality with modest engines under 650 cc for agile urban and trail navigation. Off-road motorcycles, including and enduro types, employ minimal bodywork, high ground clearance, and inverted forks to handle jumps and rough trails, with two-stroke or four-stroke engines optimized for peak power in short bursts rather than efficiency. Standard or naked bikes strip away fairings for upright and visibility, suiting commuters with mid-range engines around 500-1,000 cc that deliver versatile performance without specialized compromises. Scooters and mopeds diverge further, featuring step-through frames and automatic transmissions for urban mobility, with displacements often below 250 cc to comply with licensing exemptions in regions like ; scooters emphasize enclosed storage and CVT efficiency for fuel economy exceeding 80 . Variants extend these primaries through customization or niche adaptations, such as choppers with extended forks and minimalist derived from hot-rodding, or racers tuned for quarter-mile sprints with rear-set pegs and round headlights mimicking 1960s British speed records. outfits attach a wheeled pod, restoring three-wheel stability for loads or family use, as in Ural models with 650 cc boxers and differential drive for off-road traction. These evolutions reflect user-driven modifications, though core types remain defined by factory engineering for and across jurisdictions.

Historical Development

Precursors and Early Inventions (Pre-1900)

The development of the motorcycle originated from unpowered two-wheeled vehicles that established the fundamental principles of balance and propulsion through human power. In 1817, German inventor introduced the Laufmaschine, also known as the , a wooden two-wheeler propelled by the rider's feet pushing against the ground. Demonstrated publicly on June 12, 1817, in , , it traveled approximately 15 kilometers in one hour, addressing mobility needs amid a horse shortage following the 1816 "." This device laid the groundwork for later bicycles by proving the viability of steering via handlebars and maintaining balance at speed without . By the 1860s, pedal-driven velocipedes, such as those produced by Pierre Michaux in , refined the two-wheeled frame with iron construction and cranks attached to the front wheel, earning the nickname "boneshaker" due to their rigid ride over roads. These machines achieved speeds up to 20 km/h but remained limited by human power output, prompting experiments with mechanical propulsion to overcome terrain and endurance constraints. Early powered precursors shifted to steam engines for self-propulsion. Between 1867 and 1871, French engineers Louis-Guillaume Perreaux and Ernest Michaux adapted a Michaux by mounting a small coal-fired above the rear wheel, producing about 0.5 horsepower and enabling speeds of 10-15 km/h after a lengthy warm-up. This steam velocipede represented one of the earliest attempts to motorize a , though its weight (around 120 kg) and operational hazards like explosions restricted practical use. The transition to internal combustion engines marked a pivotal advancement in efficiency and portability. In 1884, British engineer Edward Butler patented the "Petrol Cycle," a three-wheeled velocycle with a single-cylinder horizontal engine using spray carburetion and surface ignition, exhibited in design form at the Stanley Cycle Show. Intended for speeds up to 18 km/h, it introduced key features like a float-feed and the term "petrol" for fuel, but lack of prevented production. Gottlieb Daimler and Wilhelm Maybach achieved the first operational gasoline-powered two-wheeler with the 1885 Reitwagen ("riding wagon"), featuring a wooden bicycle-like frame, 264 cc single-cylinder four-stroke engine, and belt drive to the rear wheel. Tested on November 10, 1885, in Cannstatt, Germany, it reached 12 km/h but suffered from instability, with the engine igniting the rider's clothing during early runs due to exposed hot-tube ignition. This prototype demonstrated the feasibility of compact internal combustion for two-wheeled vehicles, influencing subsequent designs despite its lack of pedals or suspension. By 1894, the & Wolfmüller became the first motorcycle offered for serial production, with a twin-cylinder, displacing 1,352 cc and delivering 2.5 horsepower via direct drive to the rear through piston movement. Marketed in at around 2,000 marks, approximately 1,000-2,000 units were built before production ceased due to reliability issues like poor and flooding in wet conditions. These pre-1900 inventions established the motorcycle's core configuration—two s, engine-mounted frame, and control—driven by the causal need for affordable, independent mechanized amid industrializing economies.

Commercialization and Early Industry (1900-1945)

The commercialization of motorcycles accelerated in the early as bicycle manufacturers adapted internal engines to two-wheeled frames, leading to annual global production of approximately 20,000 units by 1900. Key early producers included the Werner brothers in , who sold over 1,000 units in 1900, and in Britain, which began commercial production in 1902. In the United States, Indian Motorcycle Company initiated production in 1901, followed by in 1903, both leveraging single-cylinder engines for civilian transport and racing. These developments shifted motorcycles from experimental novelties to viable alternatives to horses and s, driven by improvements in engine reliability and chain-drive transmissions. By , the industry expanded with factory enlargements and international distribution networks, as American firms like Excelsior and Henderson introduced multi-cylinder models for greater power and speed. British manufacturers such as BSA entered production in , focusing on durable designs for urban and rural use. Innovations like twist-grip throttles and pedal-assisted starting enhanced usability, spurring demand amid rising and road infrastructure. However, intensified, with hundreds of small firms emerging and failing due to inconsistent quality and economic pressures. World War I markedly boosted production for military applications, replacing horses for reconnaissance and dispatch roles. manufactured over 40,000 units for Allied forces by 1918, comprising half its output, while Triumph supplied lightweight models producing 4 horsepower for British communications. Postwar surplus flooded markets, causing bankruptcies among smaller producers like Clyno and reducing civilian availability of new models. In the 1920s, surviving firms innovated with shaft drives and pressed-steel frames; BMW entered in 1923 with its R32 model featuring a longitudinally mounted boxer engine for stability. DKW in Germany became the largest producer by the early 1930s through affordable two-stroke designs. The Great Depression from 1929 decimated the sector, eliminating most U.S. makers and leaving only Indian and Harley-Davidson as major commercial producers by 1931, with recreational sales nearly halting. Recovery came via military contracts in World War II, where Harley-Davidson and Indian supplied tens of thousands of rugged bikes for Allied logistics, refining designs like solo frames and knobby tires for off-road efficacy. By 1945, wartime demands had consolidated the industry around durable, mass-producible V-twin engines, setting the stage for postwar civilian resurgence.

Postwar Expansion and Specialization (1946-1980)

Following World War II, the motorcycle industry underwent rapid expansion as economies recovered and civilian demand surged for affordable transportation and leisure vehicles. In Europe and the United States, manufacturers repurposed wartime production lines, leading to increased output of models suited for postwar consumers with growing disposable income and leisure time. Innovations from military applications, such as hydraulic telescopic forks, entered civilian markets around 1946-1947, improving suspension and rider comfort on paved roads. American firms like capitalized on this boom by producing large-displacement V-twin cruisers, such as the Panhead models introduced in 1948, which appealed to returning veterans for their power and reliability on highways. Indian Motorcycle continued briefly with Chief models featuring 74-cubic-inch engines but ceased production in 1953 amid financial difficulties, consolidating the U.S. big-bike market under . In contrast, European production emphasized smaller, economical machines; British brands like BSA and Triumph dominated with twins like the Speed Twin, though persistent issues and strikes eroded their edge by the . Japan's entry transformed the industry through aggressive innovation and . Honda, established in 1948, launched its first complete motorcycle, the D-type Dream, in 1949, focusing on lightweight, reliable designs initially for domestic use. Production escalated dramatically, from 2,633 units in 1950 to over 100,000 by mid-decade, as (starting motorcycles in 1952), Yamaha, and Kawasaki followed suit with affordable two-strokes and fours. By the late 1960s, Japanese exports flooded markets, overtaking British dominance in the U.S. due to superior build quality, vibration reduction, and features like electric starting—exemplified by 's CB750 inline-four in 1969, which set benchmarks for performance with 67 horsepower and front disc brakes. This era saw motorcycles specialize into distinct categories beyond general-purpose use. Cruisers prioritized low-seat comfort and torque for touring, as in models, while European cafe racers—lightweight stripped for speed—catered to urban racing enthusiasts. Off-road variants proliferated for emerging sports like and trials, with two-stroke engines enabling lightweight agility on unpaved terrain; BMW's opposed-twin designs advanced long-distance stability for adventure touring. Japanese firms further diversified into scooters and sport bikes, driving global segmentation and sales growth, with U.S. imports rising sharply by 1970. By 1980, the industry's shift to specialized, high-volume production had elevated motorcycles from utilitarian tools to symbols of performance and lifestyle.

Contemporary Evolution and Globalization (1981-Present)

The 1980s marked a period of technological maturation for the motorcycle industry, dominated by Japanese manufacturers who introduced electronic fuel injection systems, with Honda and Kawasaki pioneering implementations that improved efficiency and performance amid tightening emission standards. BMW's 1980 launch of the R80G/S initiated the adventure touring segment, combining on-road comfort with off-road capability through long-travel suspension and spoked wheels. This era saw sportbikes like Kawasaki's Ninja series gain prominence, emphasizing aerodynamics and high-revving engines, while global production shifted toward Asia, with Japan exporting over 4 million units annually by mid-decade. In the 1990s and early 2000s, electronic aids proliferated, including antilock braking systems (ABS) first offered by in 1988 on the K100 model, reducing stopping distances on varied surfaces, and traction control systems emerging in superbikes by the late 1990s to manage rear-wheel slip during aggressive acceleration. Engine technologies advanced with liquid cooling becoming standard in high-performance models and four-stroke dominance over two-strokes due to regulatory pressures on emissions and noise. Globalization accelerated as manufacturers like expanded production in and , capturing emerging markets in where annual sales exceeded 3 million units by 2000, driven by affordable commuting bikes. The 21st century witnessed integration of digital electronics, with ride-by-wire systems debuting in production models around 2005, enabling precise fueling and enabling features like selectable riding modes. and dual-sport motorcycles surged in popularity, with global sales of such categories growing over 20% annually in Western markets from 2010 to 2020, fueled by recreational touring demands. In developing regions, Indian firms like Bajaj and scaled production to over 20 million units yearly by the , leveraging low-cost 100-125cc engines for urban mobility, while Chinese manufacturers contributed to a global fleet surpassing 200 million motorcycles by 2010. Electrification emerged as a niche but growing trend post-2010, with models like ' SR/F achieving 200+ km range by 2019, though internal combustion engines retained over 99% globally due to limitations and cost barriers in mass markets. By 2021, worldwide new motorcycle registrations reached approximately 58 million, predominantly under 150cc in , contrasting with premium segments in and where safety tech like cornering ABS became standard. Regulatory harmonization, such as Euro 5 emissions standards effective 2020, spurred further innovations in catalytic converters and engine mapping across manufacturers.

Engineering and Design

Structural Components and Materials

The motorcycle frame, also known as the chassis, serves as the core structural element, providing torsional rigidity, supporting the engine, rider, and other components while connecting the front steering head to the rear swingarm. Common frame designs include the backbone frame, which uses a single tube running from the steering head over the engine; cradle frames (single or double), where tubes extend downward to enclose the engine for added protection and stiffness; perimeter or twin-spar frames, featuring high-side beams for enhanced rigidity in sport models; trellis frames, composed of welded steel lattice for lightweight strength in performance bikes; and monocoque frames, integrating the structure into a single shell often used in racing for minimal weight. Materials for frames predominantly consist of alloys, valued for their high tensile strength and cost-effectiveness, with mild used in entry-level models and chromoly (chromium-molybdenum) in high-performance applications for superior strength-to-weight ratios. Aluminum alloys, such as 6061-T6, are favored in and touring motorcycles for their lighter weight—approximately one-third that of —enabling better handling and , though they offer less impact resistance and require precise to avoid . Advanced composites like carbon fiber appear in premium or frames, providing exceptional stiffness and low density (around 1.6 g/cm³ versus 's 7.8 g/cm³), but at higher costs and with challenges in repairability and vibration damping. Front suspension typically employs telescopic forks, consisting of sliding tubes with internal springs and hydraulic dampers to absorb road impacts and maintain , often constructed from or aluminum for durability. Rear suspension features a —pivoting aluminum or arms linking the frame to the rear —paired with one or two shock absorbers containing coil springs and oil-filled dampers to control movement and rider comfort. Wheel rims, integral to the , are commonly cast or forged aluminum for strength and reduced unsprung weight, with alternatives in budget models to prioritize affordability over performance. Material selection balances factors like rigidity, weight (e.g., aluminum frames reducing overall by 20-30% compared to equivalents), and intended use, with empirical testing ensuring compliance with standards such as ISO 4210 for structural integrity under dynamic loads up to 10g.

Propulsion Systems and Power Delivery

Motorcycles predominantly employ internal combustion engines () utilizing reciprocating pistons in two-stroke or four-stroke cycles, with four-stroke designs dominating due to superior , power output, and compliance with emissions standards. Two-stroke engines, which complete a power cycle every revolution via port timing for and exhaust, offer higher power-to-weight ratios but suffer from higher fuel consumption and emissions, limiting their use to niche applications like . Four-stroke engines, requiring two revolutions per cycle with dedicated valves for and exhaust, provide smoother operation and better torque across RPM ranges, powering the majority of street-legal models. Engine configurations vary by cylinder count and arrangement to balance power, , and compactness. Single-cylinder engines, simplest and lightest, deliver peaky power suitable for lightweight trail bikes but exhibit notable . Parallel-twin and inline-three/four layouts offer smooth, high-revving performance for sportbikes, while V-twin and flat-twin (boxer) designs provide strong low-end and stability for cruisers and tourers, with the latter minimizing through opposed pistons. Rare configurations like V-four or rotary (Wankel) engines prioritize compactness and smoothness but face challenges in durability and efficiency. Fuel delivery has transitioned from carburetors, which mechanically mix air and via , to electronic fuel injection (EFI) systems that use sensors and ECUs for precise metering, improving cold-start reliability, response, and fuel economy by up to 10-15% while reducing emissions. Carburetors, prevalent until the early , are less adaptive to varying conditions and evaporate even when off, contributing to higher hydrocarbons; EFI's dominance accelerated post-2010 due to stricter global regulations like Euro 3/4 standards. Electric motorcycles represent an emerging propulsion alternative, utilizing brushless electric motors—typically permanent magnet AC types—directly coupled to batteries for instant torque delivery exceeding 100 Nm in models like the LiveWire ONE, without multi-gear transmissions. These systems achieve efficiencies over 90% versus ICE's 20-30%, though range is constrained by lithium-ion battery capacities, often 100-200 miles per charge as of 2023. Power from the engine or motor reaches the rear wheel via a multi-speed manual transmission (typically 5-6 gears) interlinked to a clutch, followed by final drive systems. Chain drives, using roller chains with sprockets, transfer up to 98% of power efficiently and allow gearing adjustments but demand regular lubrication and tensioning to prevent wear, lasting 10,000-20,000 miles with maintenance. Belt drives employ toothed rubber belts for quieter, cleaner operation with minimal maintenance, common on cruisers like Harley-Davidsons, though belts degrade faster under high torque and cannot be repaired. Shaft drives, via bevel gears and a longitudinal shaft, offer longevity over 50,000 miles and weather resistance—prevalent in BMW tourers—but add weight, induce torque reaction (lifting/lowering the rear under acceleration/deceleration), and reduce efficiency by 5-10% due to friction. Continuous variable transmissions (CVT) with belts or chains, standard on scooters, provide seamless ratio changes for urban efficiency.

Control Systems and Ergonomics

Motorcycle control systems encompass the primary rider-operated mechanisms for , braking, gear selection, and , designed for rapid, intuitive access during dynamic operation. The right handlebar typically features a twist-grip for speed control and a hydraulic for the front , which provides 70-80% of in most scenarios due to weight transfer dynamics under deceleration. The left handlebar houses the clutch , essential for engagement in separating power from the during shifts or stops. Foot controls include a right-foot pedal actuating the rear , often drum or disc-based, and a left-foot toe-operated shifter patterned as down for first gear and up for subsequent gears, reflecting a convention rooted in early 20th-century designs for efficient progression. These layouts adhere to ISO 9021:2020, which standardizes control types, positions, and functions across motorcycles and mopeds to minimize learning curves and errors, excluding steering-wheel variants. Ergonomics integrates control placement with rider posture to balance control precision, resistance, and biomechanical , often framed by the "motorcycle triangle" of handlebars, , and footpegs. Sportbikes employ an aggressive forward-leaning position with low clip-on handlebars and elevated rear-set footpegs, positioning the rider's weight over the for aerodynamic drag reduction and enhanced cornering leverage, though this induces wrist extension and lower back flexion that can limit beyond 1-2 hours. Cruisers prioritize a laid-back configuration with forward-extended foot controls and elevated "ape hanger" or beach bars, allowing a reclined and extended legs that distribute weight to the and promote spinal neutrality for relaxed highway cruising, but potentially compromising quick maneuvers due to increased effort from higher bars. Touring and standard bikes favor an upright neutral stance with mid-position footpegs and handlebars at chest height, aligning forearms parallel to the ground and hips at 90 degrees to the for sustained visibility and reduced transmission, with heights typically 780-850 mm to accommodate varied rider inseams. Adjustability enhances ergonomic fit, with components like risers for handlebars, sliders for footpegs, and modular seats enabling customization to rider dimensions—such as length or leg proportions—to optimize leverage and minimize reach-induced strain, as simulated by tools analyzing posture angles and torques. Empirical studies on , , and touring variants reveal consistent seat-to-control distances (e.g., 500-700 mm handlebar reach) but divergent footrest angles, with models at 40-50 degrees knee flexion versus cruisers' 110-130 degrees, influencing stability: tighter angles aid standing transitions in dual- applications, while open postures reduce risk on extended rides. Non-standard variants, such as left-side braking in some or custom builds, deviate from ISO norms and correlate with higher adaptation errors, underscoring standardization's role in causal reduction via .

Performance and Capabilities

Handling Dynamics and Physics

Motorcycle handling relies on the interplay of rider inputs, vehicle geometry, and physical principles such as gyroscopic and to maintain stability and execute maneuvers. At speeds above approximately 10 km/h, motorcycles exhibit self-stability due primarily to steering , which is the horizontal distance between the front wheel's and the projection of the steering axis onto the ground, typically ranging from 80 to 120 mm in production models. This , combined with the —the forward tilt of the steering head from vertical, often 25 degrees for sportbikes and up to 45 degrees for cruisers—creates a effect that promotes straight-line tracking and resists weave or wobble. Countersteering initiates turns by applying to the handlebars in the direction opposite to the desired lean, causing the front wheel to momentarily steer away from the turn, which shifts the bike's laterally and induces a . This technique leverages dynamic instability at low speeds but becomes effective above walking pace, where the resulting lean allows the rider to align the resultant force vector—combining and centripetal —through the center of for balanced cornering without falling. The θ satisfies tan(θ) = v²/(r g), where v is speed, r is turn radius, and g is (9.81 m/s²), limiting maximum cornering speed by available tire grip, often around 0.8-1.2 g lateral on street s. Gyroscopic effects from the spinning contribute to stability, particularly at higher speeds, where resists changes in lean angle proportional to wheel rotational speed and ; for a typical motorcycle, this effect accounts for about 12% of the restoring moment during steering but aids in maintaining upright posture during straight-line travel. However, at low speeds, stability derives more from rider balancing and than gyroscopics, as evidenced by the ability to ride slowly without significant wheel spin reliance. During acceleration, inertial forces transfer rearward, increasing the rear 's normal load and thus its capacity—up to 100% of the bike's shifting dynamically—enhancing traction for the while reducing front wheel grip, which can lead to understeer if excessive. Conversely, braking shifts forward, loading the front for superior stopping power (modern bikes achieving 1.5-2 g deceleration) but risking rear wheel unload and potential lockup without ABS. Suspension systems modulate these transfers via damping and spring rates, absorbing road inputs to preserve uniformity, with progressive designs optimizing for both compliance and control during dynamic maneuvers.

Efficiency Metrics and Records

Motorcycles demonstrate efficiencies superior to most automobiles, attributable to their reduced weight, single-rider configuration, and direct mechanical power delivery without multi-gear passenger accommodations. Aggregated empirical data from manufacturer tests and rider reports place the average across production models at approximately 55 miles per (mpg), with variations driven by size, displacement, and operational factors such as load and speed. Small-displacement engines under 125cc, common in scooters and minibikes, prioritize economy through low , lightweight components, and conservative power outputs, often exceeding 100 mpg in controlled conditions. Production models exemplify these metrics: the achieves up to 120 in real-world use, benefiting from its 125cc and minimalistic design. The CB125F similarly reports over 130 , aided by fuel injection and efficient combustion tuning. Mid-size options like the yield around 70 , balancing performance with economy via aerodynamic fairings and electronic fuel management. Cruisers and adventure bikes, such as the Rebel 300, average 78 , though heavier frames and upright reduce gains compared to faired sport models.
ModelEngine DisplacementReported MPGNotes
125cc120Minibike; tested under mixed conditions
Honda CB125F125cc130+Commuter; real-world rider data
Honda Rebel 300286cc78Cruiser; steady-state highway efficiency
399cc70Sport; includes wind resistance effects
Motorcycle owners can further optimize these efficiencies through maintenance and riding practices. Maintaining tire pressure according to manufacturer specifications minimizes rolling resistance; regularly cleaning or replacing the air filter ensures optimal airflow; routine servicing of fuel and ignition systems, along with use of recommended engine oil, reduces internal losses and enhances combustion. Riding habits such as smooth acceleration, avoiding sudden throttle changes, and maintaining steady speeds also contribute. These measures can improve fuel economy by 5-10%. Notable records underscore optimized efficiency under constrained fuel. On June 12-22, 2018, Pavitra Patro and Vishnu Mehta established a Guinness World Record for lowest fuel consumption on a trans-India motorcycle route from Kibithoo, Arunachal Pradesh, to Koteswar, Gujarat—a distance exceeding 4,000 kilometers—averaging 1.68 liters per 100 km (approximately 140 mpg). In June 2023, Acerbis set the Guinness record for greatest distance on a single tank, traversing 4,183.8 km (2,599.7 miles) on a modified Honda Monkey 125 with a 108-liter tank, capitalizing on the base model's claimed 169 mpg efficiency derived from its 125cc engine and low-drag profile. These feats reflect causal enhancements like precise throttle control and reduced rolling resistance, though production efficiencies remain bounded by emissions standards and material limits. Semi-automatic transmissions correlate with peaks up to 87 mpg fleet-wide, per comparative analyses.

Speed and Endurance Achievements

Motorcycle speed records culminate in land speed attempts at venues like the , where streamlined machines achieve extreme velocities under Fédération Internationale de Motocycliste (FIM) sanction. The absolute FIM world record for motorcycles stands at 605.698 km/h (376.363 mph), set by Robinson on the TOP 1 during a 2010 run at Bonneville, utilizing a turbocharged and advanced to minimize drag. Earlier benchmarks include Burt Munro's 1967 achievement of 296.0 km/h (184.087 mph) on a modified 1920 Indian Scout at Bonneville, notable for its reliance on hand-built components and persistent experimentation despite limited resources. These records demand precise engineering to balance power output, tire grip on salt surfaces, and stability at supersonic-equivalent speeds, where aerodynamic forces exceed gravitational ones. In circuit racing, the Isle of Man TT exemplifies speed under endurance constraints on a 60.7 km public road course. The outright lap record is 219.468 km/h (136.358 mph), established by on a in the 2023 race, covering the distance in 16 minutes 42.134 seconds and navigating variable weather, elevation changes, and 200+ corners. Class-specific records, such as the Supersport category's 130.459 km/h (81.080 mph) by on a Yamaha R6 in 2023, highlight how displacement limits and bike configurations influence peak velocities amid real-world hazards like uneven pavement. These feats underscore causal factors in speed: high-revving engines delivering over 200 horsepower, radial tires for lateral grip, and rider skill in maintaining momentum through apexes. Endurance achievements emphasize sustained performance over distance or time, often verified by . The greatest distance traveled by an individual on a motorcycle in 24 hours is 4,012.53 km (2,492.7 mi), accomplished by Iván Cervantes at the in on April 30, 2023, averaging 167.19 km/h (103.90 mph) on a prepared circuit to minimize stops. This surpasses prior marks by leveraging fuel-efficient engines, ergonomic positioning to combat , and logistical support for changes, revealing limits in human physiology and mechanical reliability under continuous load. Long-haul records, such as cross-continental traverses, further test durability; empirical data from events like the or rides indicate that chain tension, oil cooling, and are critical to averting breakdowns over thousands of kilometers.

Safety and Risk Analysis

Empirical Accident Data and Causal Factors

Motorcycle fatalities represent a disproportionate share of deaths relative to population. In the United States, motorcyclists accounted for 6,335 deaths in 2023, comprising 15% of all fatalities despite motorcycles representing only 3% of registered . The fatality rate per vehicle miles traveled for motorcyclists in 2023 was 28 times higher than for passenger car occupants. Globally, powered two- and three-wheeled contribute to nearly 30% of road crash deaths, amid an estimated 1.19 million annual road fatalities. Causal factors in motorcycle crashes stem primarily from the vehicle's inherent vulnerabilities—minimal structural protection, reduced stability from two wheels, and lower mass in collisions—compounded by rider behaviors and interactions with other road users. Single-vehicle crashes account for approximately 38% of motorcyclist fatalities, often involving loss of control due to excessive speed, impairment, or road hazards like curves or wet surfaces. Speeding contributes to 34% of fatal motorcycle crashes, as higher velocities amplify and reduce reaction times, per (NHTSA) analyses. Alcohol impairment, defined as blood alcohol concentration (BAC) of 0.08% or higher, factors into 26% of U.S. motorcyclist deaths, impairing judgment and coordination essential for balancing and maneuvering. In multi-vehicle crashes, which comprise the majority of incidents, failure of automobile drivers to detect motorcyclists is the predominant cause, with left-turn violations by oncoming vehicles responsible for 41% of such fatal events in historical NHTSA data. This perceptual error arises from the motorcycle's smaller profile and the underestimating closing speeds of smaller objects. Rider inexperience exacerbates risks, as 34% of fatally injured motorcyclists in 2023 lacked a valid motorcycle , correlating with poorer anticipation and control. Non-use of helmets, while a consequence rather than initiator, elevates fatality odds by 40% via increased head trauma severity, underscoring the causal chain from impact physics to injury outcome. Environmental and infrastructural elements further influence crash causation, though less dominantly than human factors. Roadway defects, such as potholes or , precipitate single-vehicle losses of control, while adverse reduces traction on two-wheeled vehicles more severely than on four. The Motorcycle Crash Causation Study identifies driver observation errors and distractions as primary in multi-vehicle events, with rider violations like improper lane positioning secondary. These patterns hold across datasets, emphasizing that causal realism prioritizes verifiable human and physical determinants over speculative narratives.

Mitigation Technologies and Rider Practices

Antilock braking systems (ABS) on motorcycles reduce fatal crash rates by 22% per 10,000 registered vehicle years, according to an analysis of U.S. data from 2003 to 2018 comparing models with and without ABS. Similar studies in report 27% reductions in crashes for ABS-equipped scooters in and 22% in . Traction control systems enhance stability by preventing rear-wheel spin during acceleration, particularly on slippery surfaces or during cornering, though direct empirical data on crash reductions remains limited compared to ABS; manufacturers claim improvements in control contribute to safer riding dynamics. Helmets prevent fatal injuries in 37% of rider cases and 41% of passenger cases, while reducing risk by 69%, based on analyses by the and Centers for Disease Control and Prevention. Protective clothing, including jackets with abrasion-resistant materials and armor, lowers torso injury risk by up to 80% in crashes, per updates to the 1981 from the . Gloves reduce hand injuries, though overall gear usage varies: surveys indicate 76% of riders wear gloves, 59% jackets, and 37% boots, correlating with lower hospitalization rates for adequately protected riders. Airbag vests and jackets, which deploy in milliseconds upon detecting rapid deceleration or separation from the bike, reduce chest and spinal injury severity; simulations show deflection drops significantly, lowering scores from 5 to 2 in high-impact scenarios. Real-world evidence supports decreased risks to the , chest, and spine, though comprehensive population-level crash data is emerging. Rider training courses yield mixed empirical results on accident reduction. Some evaluations find trained riders experience fewer overall motor vehicle accidents and less severe motorcycle crashes compared to untrained peers. However, other studies, including those from and the U.S., report no significant decrease in crash rates or even higher involvement among trained riders, potentially due to increased risk-taking from overconfidence. Defensive riding practices, such as maintaining following distances and scanning for hazards, lack large-scale controlled studies but align with first-principles where anticipation mitigates common collision vectors like rear-end impacts.

Policy Debates on Protection and Regulation

Mandatory helmet laws remain a focal point of policy contention, pitting of reduced fatalities against arguments for personal autonomy. Studies indicate that helmets decrease fatal injuries by 37% for operators and 41% for passengers, with states enforcing universal helmet requirements exhibiting 33% lower head-related fatality rates from 1999 to 2019 compared to those without such mandates. If all U.S. states had imposed universal helmet laws from 1976 to 2022, approximately 22,058 motorcyclist lives could have been preserved, according to analyses of historical crash data. Proponents of mandates, often drawing from perspectives, emphasize these causal reductions in head trauma severity, as evidenced by consistent findings across multiple datasets showing 27% fewer motorcyclist deaths in states with such laws. Opponents, including organizations like the , contend that helmet requirements infringe on individual liberty without addressing root causes of accidents, asserting that the most effective safeguards involve preventing crashes altogether rather than post-collision mitigation. Some empirical inquiries suggest potential behavioral offsets, where riders in mandatory-law states may exhibit altered risk-taking—either reduced exposure through safer habits or compensatory increases in speed—potentially moderating net fatality gains, though overall evidence supports mandates' efficacy in elevating usage and curbing deaths. As of mid-2025, only 19 U.S. states plus the District of Columbia enforce universal laws for all riders, reflecting persistent in balancing safety imperatives with freedom-of-choice claims; similar debates in and have led to stricter enforcement, correlating with higher compliance and lower injury rates. Regulation of riding practices, such as (also termed lane filtering), underscores tensions between operational efficiency and collision risks. Legal in since 2016 under filtered conditions (e.g., below 10 mph in stop-and-go traffic), lane splitting has sparked controversy elsewhere, with proponents citing reduced rear-end crash involvement for motorcyclists—empirically lower in permitting jurisdictions—while critics highlight elevated sideswipe hazards absent standardized protocols. By 2025, a handful of states like and permit limited filtering at low speeds (under 25 mph), but most prohibit it outright, with enforcement varying by subjective officer discretion and fines up to hundreds of dollars in non-permissive areas. Data from permissive regions indicate no disproportionate crash severity increases, yet national standardization remains elusive due to concerns over inconsistent rider training and cager (automobile ) awareness. Noise emission standards represent another regulatory flashpoint, with debates centering on whether loud exhausts enhance auditory detection (the "loud pipes save lives" slogan) or primarily constitute without proven safety dividends. Federal limits cap motorcycle noise at 80-83 decibels for new models, but aftermarket modifications often exceed these, prompting local ordinances in urban areas for stricter enforcement via stationary testing. Empirical scrutiny reveals scant causal evidence linking louder pipes to fewer collisions, as visibility and predictable behavior outweigh acoustic cues in most scenarios; instead, complaints drive policy pushes for automated monitoring or incentives for quiet exhausts, as seen in directives mandating progressive noise reductions since 2016. Broader protections, including mandatory rider education and minimum age thresholds (typically 16-18 across jurisdictions), aim to mitigate novice errors, which account for disproportionate fatalities, though debates persist on whether such interventions overregulate without commensurate erosions.

Sociocultural Dimensions

Riding Styles and Customization

Motorcycle riding styles vary by , purpose, and terrain, influencing rider posture and bike selection. Sport riding adopts an aggressive, forward-leaning position with clip-on handlebars and rear-set footpegs to minimize wind resistance and maximize control during high-speed cornering on tracks or winding roads. Cruising employs a laid-back posture with forward foot controls and elevated handlebars, prioritizing comfort for leisurely travel on low-seat-height bikes with V-twin engines. Touring styles favor upright or neutral with added windshields, luggage, and adjustable seats for extended distances, often exceeding 500 miles per day. and dual-sport riding combine upright positions with rugged suspension for mixed on- and off-road use, accommodating , trails, and pavement. In the United States, styles represent the largest market segment by unit sales, reflecting preferences for relaxed, style-oriented riding over performance extremes. Globally, standard or naked bikes, with upright and versatile engines, hold the dominant share due to their balance of utility and everyday accessibility. Off-road styles, such as or enduro, demand dynamic standing and seated positions on lightweight frames without street-legal features like mirrors or lights. Customization tailors motorcycles to individual styles, enhancing , , or through aftermarket parts. Common modifications include exhaust upgrades for improved throttle response and sound, often increasing horsepower by 5-15% depending on the system; air refinements; and suspension tuning for handling suited to specific terrains. Aesthetic changes encompass custom paint, vinyl wraps, or , with riders spending averages of 1,000−1,000-5,000 on visual overhauls to match personal or subcultural tastes. Historical custom styles include choppers, which originated in the U.S. post-World War II as returning servicemen modified surplus Harley-Davidsons by removing fenders and lights for reduced weight and drag-strip aesthetics, evolving in the with extended forks for visual drama. Cafe racers emerged in Britain, where riders stripped Triumph and BSA models of non-essentials, added rear-set controls, and tuned engines for cafe-to-cafe speed runs, capping at 100 mph ("Ton-Up Boys"). Modern practices incorporate 3D-printed components for unique prototyping, though lowering kits—popular in bobber and cafe builds—can alter geometry and compromise stability if not balanced with rake adjustments.

Subcultures and Community Dynamics

Motorcycle subcultures encompass diverse groups defined by riding styles, customization preferences, and social affiliations, ranging from touring enthusiasts and sport riders to custom builders and outlaw clubs. Cruisers and touring riders often form social riding clubs focused on long-distance travel and camaraderie, while communities emphasize track days and performance modifications. Adventure touring subcultures prioritize off-road capability and global expeditions, as seen in events like the , which originated in 1978 and attracts specialized riders. These groups typically adhere to the 's ethos of law-abiding conduct, representing the vast majority—estimated at 99%—of riders following the 1947 , where the AMA distinguished respectable enthusiasts from a fringe element. Outlaw motorcycle clubs, self-identified as "one-percenter" organizations, emerged post-World War II among disaffected veterans and have been linked to , including and , though their total membership remains a tiny fraction of the broader riding population. The , founded in 1948, maintain approximately 200 chapters worldwide with thousands of members, but empirical data indicate outlaw club affiliates comprise less than 1% of U.S. convictions despite scrutiny. Rivalries among clubs like the , Outlaws, Bandidos, and Pagans have led to conflicts, such as the 2015 Waco shooting involving multiple gangs, yet most riders view these as isolated from mainstream culture. Academic analyses note disproportionate criminal involvement among members, but caution against overgeneralizing to all bikers, given systemic media amplification of negative stereotypes potentially influenced by institutional biases. Community dynamics revolve around rallies, clubs, and online forums that foster solidarity amid shared risks and freedoms. The , held annually in since 1938, exemplified this in 2024 with 537,459 vehicles counted, reflecting robust participation despite economic fluctuations. Women's riding groups, such as the Sisters of Scota or , have proliferated, mirroring a surge in female ownership to 19% of U.S. motorcycles by 2018, up from 10% in 2009, driven by narratives and accessible models. These dynamics underscore causal factors like mechanical affinity and escape from routine, transcending class and demographics, though persist of predominantly white, male participants. Internal hierarchies in clubs enforce via patches and rituals, while broader communities advocate for rider rights through organizations like the AMA, which boasts over 300,000 members as of recent counts.

Representations in Media and Society

Motorcycles frequently appear in cinema and television as emblems of individualism, speed, and nonconformity, often intertwined with themes of rebellion or peril. The 1953 film The Wild One, featuring Marlon Brando as a motorcycle gang leader, established an enduring archetype of riders as societal disruptors, inspired by media exaggeration of the 1947 Hollister rally where minor disturbances were amplified into widespread chaos by outlets like Life magazine. This portrayal influenced subsequent depictions, such as Easy Rider (1969), which linked cross-country rides on customized Harley-Davidsons to hippie-era freedom while culminating in violence against protagonists, reinforcing associations with marginalization and risk. Later media shifted toward romanticized outlaw narratives, exemplified by the FX series (2008–2014), which dramatized a fictional entangled in firearms trafficking and inter-gang warfare, drawing from real groups like the but amplifying criminality for entertainment. Action films, including (1986) with its Kawasaki chase and Kill Bill: Vol. 1 (2003) featuring a Kawasaki ZZR250, emphasize thrill and heroism, boosting specific models' popularity through . These representations have shaped design trends, with manufacturers incorporating cinematic aesthetics like choppers post-. In society, motorcycles symbolize autonomy and escape from conformity, attracting riders seeking visceral road experiences distinct from enclosed automotive travel. Yet public perceptions often skew negative due to media focus on fringe elements, conflating hobbyists with outlaw clubs despite the latter comprising under 1% of riders; the "99%" patch worn by many club members denotes adherence to laws, countering sensationalized views of universal criminality. Qualitative studies reveal riders viewed ambivalently—as adventurous yet reckless— with media-driven stigma hindering broader acceptance, even as empirical road data attributes most incidents to visibility failures rather than rider deviance. Mainstream depictions rarely highlight the law-abiding majority, perpetuating misconceptions that overlook motorcycles' role in fostering community bonds among diverse participants.

Regulatory Frameworks

Licensing Requirements and Enforcement

Motorcycle licensing requirements typically mandate a minimum age, completion of theoretical tests, and practical skills assessments to ensure riders possess adequate competence for operating two-wheeled , which exhibit higher crash risks due to limited stability and exposure compared to automobiles. These systems often employ graduated licensing with power-to-weight restrictions to mitigate novice errors, reflecting empirical evidence that inexperienced riders contribute disproportionately to accidents via overestimation of control capabilities. In the , licenses are categorized by vehicle power and engine size, with minimum ages escalating for higher capacities: category AM for mopeds (up to 50cc or 4kW, age 15 in some member states), A1 for light motorcycles (up to 125cc and 11kW, age 16), A2 for medium motorcycles (up to 35kW, age 18, requiring two years' A1 experience or direct testing), and unrestricted A (age 24, or 20 with two years' A2). Applicants must pass a on and hazards, followed by a practical test evaluating maneuvers like slow-speed control, braking, and obstacle avoidance; mandatory training hours vary by country but emphasize risk recognition. United States requirements differ by state but uniformly require a motorcycle endorsement on a , with minimum ages generally 16 for learners' permits and 18 for full endorsements without supervision. Candidates must pass a vision screening, written knowledge test on traffic laws and motorcycle dynamics, and an on-cycle skills test assessing acceleration, turning, and emergency stops; completion of a Motorcycle Safety Foundation (MSF) Basic RiderCourse often waives the skills test in most states. Learner permits impose restrictions such as no passengers, daytime-only riding, and use, aiming to build experience incrementally. Enforcement involves routine traffic stops by law to verify validity, often triggered by observed violations or checkpoints, with unlicensed operation classified as a in many jurisdictions. Penalties include fines ranging from $100 to $500 for initial offenses, potential with daily storage fees exceeding $100, points on records leading to suspension, and jail time up to six months for repeats or aggravating factors like recklessness. In states like and Washington, additional sanctions fund safety programs, while invalid foreign licenses without International Driving Permits (IDPs) exacerbate penalties for non-residents, as IDPs merely translate but do not substitute for valid national endorsements. Non-compliance also voids coverage, amplifying financial liabilities in crashes.

Operational Restrictions and Innovations

Operational restrictions on motorcycles encompass licensing tiers, road access limitations, and environmental controls designed to mitigate risks associated with their high power-to-weight ratios and maneuverability. In the , full Category A licenses for unrestricted motorcycles require riders to be at least 24 years old or 20 with two years of experience on lighter categories, reflecting graduated systems to build skills progressively. Tiered licensing is common globally, with many countries limiting novice riders to engines under 500cc or 47kW power output to reduce severity. Expressway access varies; for instance, certain U.S. states prohibit motorcycles below 150cc or 5 horsepower, citing insufficient speed capabilities for safe merging. Noise emissions are federally capped in the U.S. at 80 dBA for motorcycles manufactured after 1985, measured at 50 feet, with requirements for functional mufflers to curb public disturbance, though enforcement inconsistencies persist across states. Lane positioning rules further constrain operations, particularly regarding filtering or splitting traffic. Lane splitting—riding between lanes of slow or stopped vehicles—is explicitly legal only in among U.S. states, with guidelines limiting speeds to 10 mph above surrounding traffic, while prohibited in states like and to avoid collisions. In , practices differ: permitted in countries such as , , and the under conditions like speed limits relative to adjacent vehicles, but strictly banned in except during filtering at low speeds. These restrictions stem from empirical data linking improper lane use to multi-vehicle crashes, though proponents argue regulated splitting reduces rear-end risks in congestion. Regulatory innovations address these constraints through mandatory technologies and adaptive policies. The mandated anti-lock braking systems (ABS) on all new motorcycles over 125cc starting January 1, 2016, following evidence that ABS reduces fatal crashes by up to 31% in single-vehicle accidents and 37% in multi-vehicle ones. This extends to advanced emergency braking on larger bikes, enhancing control under restrictions like wet-weather advisories. For smaller vehicles, pushes for ABS on under-125cc models and practical tests for mopeds with a minimum rider age of 16, aiming to standardize safety without overly burdening entry-level access. Electric motorcycles innovate compliance with emission zones; recent classifications impose speed caps (e.g., 25-45 km/h for e-bikes mimicking mopeds) but grant low-emission exemptions in urban areas, facilitating greener operations amid tightening pollution standards. Graduated licensing evolutions, such as power-to-weight ratios, further innovate by tying restrictions to verifiable rider competence rather than arbitrary engine sizes.

Impacts and Trade-offs

Environmental Footprint and Empirical Comparisons

Motorcycles typically generate lower tailpipe CO2 emissions per vehicle-kilometer traveled than automobiles, owing to superior from lighter weight and smaller engines. Real-world testing indicates average motorcycle fuel consumption of 3 to 5 liters per 100 km, compared to 6 to 8 liters per 100 km for cars, translating to roughly 80-120 g CO2 per km for motorcycles versus 140-190 g CO2 per km for , assuming standard carbon content. Per -kilometer, which accounts for typical single-rider use versus average occupancy of 1.5-1.6 persons, motorcycle emissions remain lower or comparable, with some analyses equating them directly to on this metric. However, non-CO2 pollutants present a mixed profile: smaller motorcycle engines often emit higher hydrocarbons (HC) and nitrogen oxides (NOx) per kilometer than cars due to less efficient catalytic converters and carbureted systems in entry-level models, though modern fuel-injected units narrow this gap. European Union Euro 5 standards, implemented from 2020 and extended by Euro 5+ in 2025 for durability and on-board diagnostics, impose stricter limits on CO (1.0 g/km), HC+NOx (0.1 g/km), and particulate matter than contemporaneous U.S. EPA Tier 3 rules, which allow higher thresholds like 1.4 g/km CO for some classes. Compared to buses (20-50 g CO2 per passenger-km at high occupancy) or trucks, motorcycles offer efficiency advantages for low-density urban travel but exceed bicycles (near-zero motorized emissions). Life-cycle assessments, encompassing extraction, , use, and disposal, further underscore motorcycles' reduced relative to . Producing a typical 250-500 cc motorcycle requires 20-30% less , aluminum, and than a , yielding cradle-to-grave emissions of approximately 20-40 tons CO2 equivalent over 50,000-100,000 km lifetime mileage, versus 50-80 tons for cars under similar assumptions. Electric motorcycles amplify these benefits in regions with low-carbon grids, cutting operational emissions by 50-80% over internal equivalents, though battery production adds upfront impacts equivalent to 10,000-20,000 km of use. from high-revving engines and tire wear contribute ancillary effects, but these are minor relative to exhaust gases and pale against or heavy trucking.
MetricMotorcycle (avg.)Passenger Car (avg.)Notes
Fuel Efficiency (km/L)20-4010-15Vehicle-km basis; varies by model and conditions.
CO2 (g/vehicle-km)80-120140-190Tailpipe only.
Lifecycle CO2e (tons/vehicle lifetime)20-4050-80Over 50,000-100,000 km.
HC+NOx (g/km, regulated)0.1 (Euro 5)0.06-0.09 (Euro 6)Stricter car limits reflect scale differences.

Economic Role and Market Realities

The global motorcycle market generated revenues of approximately USD 71.92 billion in 2024, with projections estimating growth to USD 75.82 billion in 2025 and USD 119.09 billion by 2032, driven primarily by demand in emerging economies for affordable personal mobility. Worldwide unit sales reached a record 62.1 million motorcycles in 2024, reflecting a 2.9% increase from the prior year, though growth varies sharply by region, with accounting for the majority due to high-volume production in countries like and . In terms of market leadership, maintained dominance in early 2025 with approximately 4.9 million units sold globally in the first quarter, followed by Indian firms (1.36 million), Yamaha (1.15 million), and TVS Motor (962,262), underscoring the shift toward low-displacement models suited to mass-market needs in developing regions. Exports play a pivotal role, with leading at USD 9.61 billion in 2023, followed by (USD 3.39 billion) and (USD 3.24 billion), while imports into markets like the exceed exports, resulting in trade deficits such as USD 256 million monthly in mid-2025. In the U.S., sales declined by 9.2% year-to-date through June 2025, totaling about 271,205 units, contrasting with robust growth in where motorcycles facilitate urban delivery and informal economies. Economically, motorcycles underpin job creation and GDP contributions, particularly in developing countries where they enable small-scale , such as motorcycle in and , supporting local mobility and commerce amid infrastructure limitations. In , the sector added about €2.1 billion to GDP in recent assessments through and aftermarket activities, sustaining around 38,400 jobs. However, market realities include vulnerability to tariffs—such as proposed 25% duties on imports—which could elevate prices in import-dependent markets like the U.S., potentially curbing demand for foreign brands while favoring domestic production. Overall, the industry's growth hinges on affordable fuel-efficient models in high-density populations, though saturation in mature markets and rising safety-related costs pose ongoing challenges to profitability.

References

  1. https://www.federalregister.gov/documents/2006/11/24/E6-19824/federal-motor-vehicle-safety-standards-definition-of-motorcycle-denial-of-petition-for-rulemaking
  2. https://www.nhtsa.gov/interpretations/nht81-311
  3. https://www.thoughtco.com/history-of-the-motorcycle-1992151
  4. https://www.ericomotorsports.com/blog/who-invented-the-motorcycle--44604
  5. https://www.indianmotorcycle.com/en-us/articles/buying-guides/different-types-of-motorcycles/
  6. https://www.dairylandinsurance.com/resources/types-of-motorcycles
  7. https://www.fortunebusinessinsights.com/motorcycle-market-105164
  8. https://www.who.int/news/item/10-10-2022-new-global-guidelines-to-curb-motorcycle-crash-deaths
  9. https://www.iihs.org/research-areas/fatality-statistics/detail/motorcycles-and-atvs
  10. https://www.accessscience.com/content/436400
  11. https://auto.howstuffworks.com/motorcycle.htm
  12. https://arxiv.org/pdf/1611.03857
  13. https://www.canyonchasers.net/2024/03/how-do-motorcycles-turn/
  14. https://www.etymonline.com/word/motorcycle
  15. https://wordzo.com/words/motorcycle.html
  16. https://www.runmotorun.com/motorcycle-musings/origin-of-the-motorcycle
  17. https://www.law.cornell.edu/cfr/text/40/205.151
  18. https://www.chp.ca.gov/programs-services/programs/california-motorcyclist-safety/motorcycles-and-similar-vehicles/
  19. https://lawbike.com/post/what-constitutes-a-motorcycle-scooters-mopeds-and-other-vehicles/
  20. https://www.genuinescooters.com/pages/scooter-and-motorcycle-laws-by-state
  21. https://www.motorcyclelegalfoundation.com/scooters-mopeds-and-go-peds/
  22. https://www.cycleworld.com/lets-talk-about-different-types-motorcycles/
  23. https://quizlet.com/799441679/msf-basic-ecourse-motorcycle-types-flash-cards/
  24. https://www.nicecnc.com/blogs/news/guide-to-different-types-of-motorcycles-for-beginners
  25. https://www.vikingbags.com/blogs/news/different-types-of-motorcycles
  26. https://monimoto.com/blog/motorcycle-advice/types-of-motorcycles/
  27. https://www.rideto.com/blog/motorcycle-types/
  28. https://ride.vision/blog/13-motorcycle-types-and-how-to-choose-one/
  29. https://www.runmotorun.com/motorcycle-musings/types-of-motorcycles
  30. https://americanhistory.si.edu/collections/search/object/nmah_843083
  31. https://www.cyclinguk.org/cycle/draisienne-1817-2017-200-years-cycling-innovation-design
  32. https://www.historyofinformation.com/detail.php?id=2054
  33. https://ingeniumcanada.org/channel/articles/it-will-huff-it-will-puff-but-it-might-not-be-rollin-up-that-hill-the-steam-0
  34. https://thevintagent.com/2011/04/07/steam-cycles-and-history/
  35. https://www.gettyimages.com/detail/news-photo/19th-century-illustration-showing-michaux-perreauxs-steam-news-photo/1048118922
  36. https://www.bridgemanimages.com/en-US/noartistknown/19th-century-illustration-showing-michaux-perreaux-s-steam-velocipede-a-steam-powered-velocipede/nomedium/asset/5311499
  37. https://www.gracesguide.co.uk/Edward_Butler_%281862-1940%29
  38. https://3-wheelers.com/butler.html
  39. https://www.wired.com/2011/08/0830daimler-first-true-motorcycle/
  40. https://haustrom.com/blogs/news/the-first-motorcycle-was-built-in-1885-and-it-was-called-reitwagen-or-riding-car
  41. https://mercedes-benz-publicarchive.com/marsClassic/en/instance/ko/Daimler-riding-car.xhtml?oid=5972&relId=1001&resultInfoTypeId=172
  42. https://www.barbermuseum.org/spotlight/1894-hildebrand-wolfmuller/
  43. https://www.thehenryford.org/collections-and-research/digital-collections/artifact/23190/
  44. https://www.hagerty.com/media/buying-and-selling/auctions/the-oldest-motorcycle-in-existence-is-for-sale-129-years-after-being-born/
  45. https://www.motolegends.com/library/motorcycling-1900-1945
  46. https://motorcycletimeline.com/1900-2/
  47. https://www.dypistonring.com/industry-news/brief-introduction-of-the-evolution-of-motorcycles.html
  48. https://www.motorcyclistonline.com/early-motorcycles-in-america/
  49. https://cybermotorcycle.com/euro/britain-1920s.htm
  50. http://archivemoto.com/thearchive/2017/4/6/the-american-motorcycle-and-wwi-part-ii
  51. https://soundharley.com/news-article/58451/harley-davidson-military-history
  52. https://www.endscuoio.com/military-motorcycles-in-world-war-one/
  53. https://www.bikesure.co.uk/bikesureblog/2018/11/motorcycles-of-world-war-1/
  54. https://www.runmotorun.com/motorcycle-musings/german-motorcycle-history
  55. https://auto.howstuffworks.com/1930-1940s-other-motorcycle-manufacturers-channel.htm
  56. https://www.audrainautomuseum.org/balance-and-power/between-the-world-wars
  57. https://www.history.com/articles/motorcycle-gangs-origins-wwii-veterans
  58. https://www.lowbrowcustoms.com/blogs/events-features/wwii-impact-motorcycles
  59. https://www.encyclopedia.com/social-sciences-and-law/economics-business-and-labor/businesses-and-occupations/motorcycle-industry
  60. https://www.totalmotorcycle.com/future/
  61. https://www.classic.com/m/indian-motorcycle/year-1946/
  62. https://www.cycleworld.com/story/bikes/as-the-us-market-exploded-japan-took-over/
  63. https://hondanews.com/releases/defining-the-80s
  64. https://magazine.cycleworld.com/article/1967/11/1/the-history-of-japanese-motorcycles
  65. https://www.csm-research.com/the-global-impact-of-japanese-motorcycle-manufacturers/
  66. https://www.audrainautomuseum.org/balance-and-power/post-war-power-through-the-50s-and-60s
  67. https://motorcycletimeline.com/1980-2/
  68. https://www.ridenow.com/blog/the-timeline-and-history-of-motorcycles--99134
  69. https://www.timetoast.com/timelines/motorcycles-from-the-70s
  70. https://global.honda/en/about/history-digest/1980/
  71. https://www.csm-research.com/the-evolution-of-motorcycle-market-trends-a-three-decade-perspective-from-csm-international/
  72. https://www.wipo.int/web-publications/world-intellectual-property-report-2024/en/4-the-evolution-of-the-motorcycle-industry-from-golden-age-to-green-revolution.html
  73. https://www.itf-oecd.org/sites/default/files/docs/lillehammer08rogers.pdf
  74. https://www.statista.com/outlook/mmo/motorcycles/worldwide
  75. https://www.wipo.int/edocs/pubdocs/en/wipo-pub-econstat-wp-83-en-the-evolution-of-the-two-wheeler-industry-a-comparative-study-of-italy-japan-and-india.pdf
  76. https://www.g-w.com/assets/files/pdf/sampchap/9781685844486_Ch18.pdf
  77. https://www.topspeed.com/motorcycles/guides/explained-the-five-most-popular-types-of-motorcycle-frames/
  78. https://roberts.com.ph/blog/understanding-types-motorcycle-chassis/
  79. https://marathamotorcycles.com/blog/uncategorized/choosing-the-right-tubing-for-motorcycle-frames/
  80. https://www.jswonemsme.com/blogs/blogs-articles/cracking-the-motorcycle-code-5-important-steels-used-in-two-wheelers
  81. https://www.luxonmx.com/blog-luxon-structural-motorcycle-materials.html
  82. https://www.dubizzle.com/blog/cars/motorcycle-frame-types/
  83. https://mahanrasouli.com/composite-materials-motorcycle-design/
  84. https://www.uti.edu/blog/motorcycle/motorcycle-suspension-systems
  85. https://www.infinitymotorcycles.com/news-and-events/basic-motorbike-components
  86. https://www.thezebra.com/resources/driving/parts-of-a-motorcycle/
  87. https://www.revzilla.com/common-tread/why-things-are-the-way-they-are-frame-design
  88. https://www.redexadditives.com/blog/understanding-different-motorcycle-engine-types/
  89. https://www.twistedroad.com/blog/posts/your-guide-to-motorcycle-engine-types-from-singles-to-v4s
  90. https://www.venhill.co.uk/news/post/types-of-motorcycle-engines
  91. https://www.vikingbags.com/blogs/news/the-pros-and-cons-of-every-motorcycle-engine-type
  92. https://cardosystems.com/blogs/cardo-blog/what-are-the-different-types-of-motorcycle-engines-your-guide-to-motorcycle-engines
  93. https://www.topspeed.com/top-motorcycle-engine-configurations/
  94. https://www.revzilla.com/common-tread/why-things-are-fuel-injection
  95. https://www.bikeleague.in/motorcycle-articles/motorcycle-technical-articles/fuel-injection-vs-carburetor-motorcycle-comparison/
  96. https://www.tvsmotor.com/media/blog/explained-carburetion-vs-fuel-injection/
  97. https://www.livewire.com/livewire-one-electric-motorcycle
  98. https://www.happyrunsports.com/blogs/electric-motorcycle/what-you-need-to-know-about-electric-motorcycle-engines
  99. https://cardosystems.com/blogs/cardo-blog/belt-drive-vs-chain-drive-vs-shaft-drive-motorcycles-understanding-the-types-of-motorcycle-drive-trains
  100. https://pj1.com/blog/shaft-vs-chain-vs-belt-drive-motorcycles/
  101. https://www.motorcyclistonline.com/all-about-motorcycle-chains-belts-and-drive-shafts/
  102. https://www.tvsmotor.com/media/blog/chain-vs-belt-vs-shaft-drive-motorcycle-final-drive-systems-explained-with-their-characteristics/
  103. https://sgi.sk.ca/motorcycle/-/knowledge_base/motorcycle-handbook/know-your-motorcycle-controls
  104. https://www.motorcycle.com/bikes/how-to/how-to-set-up-your-motorcycle-controls-to-fit-44596795
  105. https://www.rideto.com/blog/motorcycle-controls/
  106. https://www.reddit.com/r/motorcycles/comments/1ahdhq5/history_of_motorcycle_control_schemes/
  107. https://www.iso.org/standard/71553.html
  108. https://tro.bike/motorcycle-touring/triangle/
  109. https://www.vikingbags.com/blogs/news/a-detailed-guide-to-motorcycle-riding-positions
  110. https://us.saint.cc/blogs/journal/motorcycle-riding-positions
  111. https://www.outerbankshd.com/blog/perfect-touring-motorcycle-riding-stance-enhance-comfort-on-long-trips--99561
  112. https://cycle-ergo.com/
  113. https://www.sae.org/papers/commonality-differences-cruiser-sport-touring-motorcycles-ergonomics-study-2007-01-0438
  114. https://www.quora.com/Why-do-all-motorcycles-have-their-transmission-on-the-left-side
  115. https://www.cycleworld.com/2015/05/22/cycle-world-tips-and-tricks-understanding-motorcycle-rake-and-trail/
  116. https://ridermagazine.com/2009/06/30/understanding-motorcycle-rake-and-trail/
  117. https://www.revzilla.com/common-tread/what-is-countersteering
  118. https://motorbikecoach.substack.com/p/counter-steering
  119. https://rider-ed.com/wp-content/uploads/2023/09/MotorcycleSpeedAndSteering.pdf
  120. https://marathamotorcycles.com/blog/motorcycle/understanding-the-physics-behind-motorcycle-stability/
  121. https://www.datamc.org/data-acquisition/gps-data-analysis/front-and-rear-weight/
  122. https://www.msgroup.org/Tip.aspx?Num=074
  123. https://ctrideguide.com/blog/motorcycle-tips/comparing-gas-mileage/
  124. https://www.totalmotorcycle.com/MotorcycleFuelEconomyGuide/index/
  125. https://www.nawarhorse.com/blog/top-fuel-efficient-motorcycles-by-mpg--99396
  126. https://www.riders-share.com/blog/article/fuel-efficient-motorcycles-by-mpg
  127. https://lawtigers.com/most-fuel-efficient-motorcycles-your-guide-to-greater-mpg/
  128. https://www.twistedroad.com/blog/posts/15-most-fuel-efficient-motorcycles-your-guide-to-greater-mpg
  129. https://www.arsenalharley.com/blog/tips-to-improve-your-motorcycles-fuel-efficiency--97068
  130. https://www.steelcityharley.com/blog/how-can-motorcycle-riders-improve-fuel-efficiency-and-save-money-on-gas--84006
  131. https://www.guinnessworldrecords.com/world-records/514704-lowest-fuel-consumption-trans-india-motorcycle
  132. https://www.advpulse.com/adv-news/honda-monkey-breaks-world-record-covering-4183-km-on-single-tank/
  133. https://www.fim-landspeed-worldrecords.com/
  134. https://www.indianmotorcycle.com/en-us/burt-munro/
  135. https://nrmotoco.com/motorcycle-land-speed-records/
  136. https://www.iomttraces.com/racing/page/lap-and-race-records/
  137. https://www.guinnessworldrecords.com/world-records/greatest-distance-on-a-motorcycle-in-24-hours-%28individual%29
  138. https://www.motorcycle.com/top10/top-10-motorcycle-endurance-records.html
  139. https://injuryfacts.nsc.org/motor-vehicle/road-users/motorcycles/
  140. https://www.trafficsafetymarketing.gov/safety-topics/motorcycle-safety
  141. https://www.who.int/news-room/fact-sheets/detail/road-traffic-injuries
  142. https://www.nhtsa.gov/book/countermeasures-that-work/motorcycle-safety/understanding-problem
  143. https://www.msmithlawoffices.com/top-10-causes-of-motorcycle-accidents-and-how-to-avoid-them/
  144. https://www.ghsa.org/state-laws-issues/motorcyclists
  145. https://dmv.ny.gov/more-info/motorcycle-safety-awareness-training
  146. https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/813732
  147. https://www.nhtsa.gov/sites/nhtsa.gov/files/810887.pdf
  148. https://www.iihs.org/news/detail/largest-study-of-its-kind-strengthens-argument-for-motorcycle-abs
  149. https://pubmed.ncbi.nlm.nih.gov/24884403/
  150. https://motoress.com/ride/motorcycle-traction-control/
  151. https://injuryfacts.nsc.org/motor-vehicle/occupant-protection/motorcycle-helmets/
  152. https://archive.cdc.gov/www_cdc_gov/policy/hi5/motorcycleinjury/index.html
  153. https://shopmrmoto.co.nz/blogs/news/dont-get-scraped-the-stats-on-motorcycle-jacket-effectiveness
  154. https://pubmed.ncbi.nlm.nih.gov/30901230/
  155. https://callkellycall4.com/blog/how-effective-is-motorcycle-safety-gear/
  156. https://www.ircobi.org/wordpress/downloads/irc19/pdf-files/76.pdf
  157. https://www.denvertrial.com/are-motorcycle-airbags-effective-at-preventing-injury/
  158. https://www.sciencedirect.com/science/article/abs/pii/0022437589900327
  159. https://www.sciencedirect.com/science/article/pii/S136984782400305X
  160. https://rosap.ntl.bts.gov/view/dot/58215/dot_58215_DS1.pdf
  161. https://smarter-usa.org/wp-content/uploads/2017/06/6.-2007-effectiveness-of-motorcycle-training-and-motorcyclists-risk-taking-behavior-savolainen-mannering-trr-2031-2007.pdf
  162. https://www.maxwell.syr.edu/research/lerner-center/population-health-research-brief-series/article/motorcycle-fatality-rates-due-to-head-injuries-are-lower-in-states-with-helmet-laws
  163. https://www.iihs.org/news/detail/lax-helmet-laws-have-killed-more-than-20-000-motorcyclists-study-shows
  164. https://www.sciencedirect.com/science/article/abs/pii/S0167629608001926
  165. https://nevadapolicy.org/commentary/helmet-laws-heading-off-personal-freedom/
  166. https://pubmed.ncbi.nlm.nih.gov/25958794/
  167. https://bikenrider.com/news/the-great-helmet-debate-mandatory-helmet-laws-in-2025-safety-vs-freedom
  168. https://academic.oup.com/ije/article/40/3/794/746475
  169. https://ridermagazine.com/2022/12/15/sponsored-content-lane-splitting-remains-controversial-can-it-eventually-become-national-law/
  170. https://www.facebook.com/MnPublicSafety/posts/lane-sharing-also-know-as-splitting-and-filtering-is-now-legal-for-motorcycles-g/1147766190724796/
  171. https://www.motorcyclelegalfoundation.com/lane-splitting-debate/
  172. https://www.quora.com/Why-is-the-noise-produced-by-motorcycles-not-regulated
  173. https://www.torklaw.com/consumer-news/do-loud-pipes-save-lives/
  174. https://www.youtube.com/watch?v=AlaegpeO20I
  175. https://pmc.ncbi.nlm.nih.gov/articles/PMC1781413/
  176. https://waynesvillecycle.com/all-you-need-to-know-about-the-different-types-of-motorcycles/
  177. https://www.bennetts.co.uk/bikesocial/news-and-views/advice/new-riders-and-training/types-of-motorcycles-guide
  178. https://nrmotoco.com/top-selling-motorcycles-in-the-usa/
  179. https://www.dairylandinsurance.com/resources/motorcycle-customization-tips
  180. https://info.sscycle.com/performance-times/10-of-the-best-ways-to-customize-your-motorcycle
  181. https://deadbeatcustoms.com/a-brief-history-of-the-chopper-motorcycle
  182. https://purposebuiltmoto.com/blogs/news/history-of-the-cafe-racer
  183. https://www.csm-research.com/motorcycle-customization-trends-around-the-world/
  184. https://www.bestbeginnermotorcycles.com/custom-mods-that-can-hurt-your-motorcycle/
  185. https://daily.jstor.org/history-motorcycle-communities/
  186. https://www.vikingbags.com/blogs/news/motorcycle-culture-in-america
  187. https://info.publicintelligence.net/LA-OutlawBikers.pdf
  188. https://journals.sagepub.com/doi/10.1177/1477370820980440
  189. https://www.bikernet.com/statistics-prove-outlaw-motorcycle-clubs-not-a-public-threat/
  190. https://sturgis.com/blogs/how-many-people-attended-the-85th-2025-sturgis-rally/
  191. https://ridermagazine.com/2018/12/04/motorcycle-ownership-among-women-climbs-to-19-percent/
  192. https://www.encyclopedia.com/social-sciences/encyclopedias-almanacs-transcripts-and-maps/motorcycles-and-motorcycle-cultures
  193. https://digitalcommons.csumb.edu/cgi/viewcontent.cgi?article=1010&context=caps_thes
  194. https://soundharley.com/news-article/57011/harley-davidson-motorcycles-in-movies
  195. https://shop.goldstarharley.com/Blog.aspx?BlogID=6&Type=Lookup
  196. https://www.usatoday.com/story/news/nation-now/2015/05/20/popular-culture-movies-motorcycle-gangs-sons--anarchy/27636871/
  197. https://andromedamoto.com/blogs/articles/famous-motorcycles-in-movies
  198. https://acmebikesusa.com/motorcycles-in-pop-culture-how-film-and-tv-have-shaped-bike-trends/
  199. https://marathamotorcycles.com/blog/bike/understanding-the-symbolism-of-99-in-biker-culture/
  200. https://www.sciencedirect.com/science/article/abs/pii/S0001457511001710
  201. https://www.cnn.com/2015/10/06/opinions/dulaney-lisa-ling-motorcycle-clubs
  202. https://road-safety.transport.ec.europa.eu/european-road-safety-observatory/statistics-and-analysis-archive/powered-two-wheelers/learning-testing-and-licensing_en
  203. https://www.nhtsa.gov/book/countermeasures-that-work/motorcycle-safety/countermeasures/legislation-and-licensing-1
  204. https://europa.eu/youreurope/citizens/vehicles/driving-licence/get-driving-licence/index_en.htm
  205. https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:02006L0126-20180722
  206. https://www.dmv.ca.gov/portal/handbook/motorcycle-handbook/license-requirements/
  207. https://dmv.ny.gov/driver-license/get-a-motorcycle-learner-permit-and-license
  208. https://www.dmv.virginia.gov/licenses-ids/motorcycle/getting
  209. https://dds.georgia.gov/how-do-i-class-m-motorcycle-license
  210. https://www.flhsmv.gov/driver-licenses-id-cards/motorcycle-rider-education-endorsements/
  211. https://flemingattorneys.com/motorcycle-accidents/licensing-requirements/
  212. https://www.gruber-law.com/blog/penalty-riding-without-motorcycle-license/
  213. https://app.leg.wa.gov/rcw/default.aspx?cite=46.20.500
  214. https://www.aaa.com/vacation/idpf.html
  215. https://www.drakeinjurylawyers.com/penalty-for-driving-without-a-motorcycle-license/
  216. https://www.femamotorcycling.eu/yes-motorcycles-use-less-fuel-than-cars-heres-the-proof/
  217. https://www.caee.utexas.edu/prof/kockelman/public_html/TRB13MC_BCA.pdf
  218. https://www.sciencedirect.com/science/article/pii/S1361920921000687
  219. https://afdc.energy.gov/data/10311
  220. https://www.sciencedirect.com/science/article/pii/S221067072300269X
  221. https://www.cycleworld.com/sport-rider/motorcycle-emission-standards-ask-geek/
  222. https://www.kamaxgroup.com/news/motorcycle-emissions-standards-understanding-euro-5-and-euro-5
  223. https://ourworldindata.org/travel-carbon-footprint
  224. https://www.researchgate.net/publication/350615355_Environmental_Assessment_of_Motorcycle_using_a_Life-Cycle_Perspective
  225. https://www.sciencedirect.com/science/article/pii/S0048969722005113
  226. https://riderperformancemotorcycles.com/the-environmental-impact-of-motorcycle-riding-balancing-passion-with-planet/
  227. https://www.motorcyclesdata.com/2025/06/05/world-motorcycles-market/
  228. https://barebonesmc.com/who-are-the-world-biggest-motorcycle-brands-2025/
  229. https://oec.world/en/profile/hs/motorcycles-and-cycles
  230. https://www.csm-research.com/motorcycle-taxi-services-in-developing-countries/
  231. https://www.acem.eu/new-research-highlights-the-economic-and-mobility-benefits-of-two-wheelers-in-europe/
  232. https://www.wcshipping.com/blog/motorcycle-tariff-impact-how-25-duties-reshape-us-import-market
  233. https://www.motorcyclesdata.com/2025/07/24/united-states-motorcycles-market/
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