Road bicycle racing

Road bicycle racing is the cycle sport discipline of road cycling, held primarily on paved roads. Road racing is the most popular professional form of bicycle racing, in terms of numbers of competitors, events and spectators. The two most common competition formats are mass start events, where riders start simultaneously and race to a set finish point; and time trials, where individual riders or teams race a course alone against the clock. Stage races or "tours" take multiple days, and consist of several mass-start or time-trial stages ridden consecutively.

Professional racing originated in Western Europe, centred in France, Spain, Italy and the Low Countries. Since the mid-1980s, the sport has diversified, with races held at the professional, semi-professional and amateur levels, worldwide. The sport is governed by the Union Cycliste Internationale (UCI). As well as the UCI's annual World Championships for men and women, the biggest event is the Tour de France, a three-week race that can attract over 500,000 roadside supporters a day.

Road racing in its modern form originated in the late 19th century. It began as an organized sport in 1868. The sport was popular in the western European countries of France, Spain, Belgium, and Italy, and some of those earliest road bicycle races remain among the sport's biggest events. These early races include Liège–Bastogne–Liège (established 1892), Paris–Roubaix (1896), the Tour de France (1903), the Milan–San Remo and Giro di Lombardia (1905), the Giro d'Italia (1909), the Volta a Catalunya (1911), and the Tour of Flanders (1913). They provided a template for other races around the world.

Cycling has been part of the Summer Olympic Games since the modern sequence started in Athens in 1896.

Historically, the most competitive and devoted countries since the beginning of 20th century were Belgium, France and Italy, then road cycling spread in Colombia, Denmark, Germany, Luxembourg, the Netherlands, Portugal, Spain and Switzerland after World War II. However, as the sport grows in popularity through globalization, countries such as Kazakhstan, Australia, Russia, Slovakia, South Africa, Ecuador, New Zealand, Norway, the United Kingdom, Ireland, Poland and the United States continue to produce world-class cyclists.

The first women's road championships were held in France in 1951. A women's road race discipline was added to the UCI Road World Championships at the 31st edition of the World Championships in 1958 in Reims.

Professional single-day race distances may be as long as 180 miles (290 km). Courses may run from place to place or comprise one or more laps of a circuit; some courses combine both, i.e., taking the riders from a starting place and then finishing with several laps of a circuit (usually to ensure a good spectacle for spectators at the finish). Races over short circuits, often in town or city centres, are known as criteriums.

Individual time trial (ITT) is an event in which cyclists race alone against the clock on flat or rolling terrain, or up a mountain road. A team time trial (TTT), including two-man team time trial, is a road-based bicycle race in which teams of cyclists race against the clock. In both team and individual time trials, the cyclists start the race at different times so that each start is fair and equal. Unlike individual time trials where competitors are not permitted to 'draft' (ride in the slipstream) behind each other, in team time trials, riders in each team employ this as their main tactic, each member taking a turn at the front while teammates 'sit in' behind. Race distances vary from a few km (typically a prologue, an individual time trial of usually less than 5 miles (8.0 km) before a stage race, used to determine which rider wears the leader's jersey on the first stage) to between approximately 20 miles (32 km) and 60 miles (97 km).