Mountain biking began in the 1970s, originally as a downhill sport, practised on customized cruiser bicycles around Mount Tamalpais.Most mountain biking takes place on dirt roads, trails and in purpose-built parks. Downhill mountain biking has just evolved in the recent years and is performed at places such as Whistler Mountain Bike Park. Slopestyle, a form of downhill, is when riders do tricks such as tailwhips, 360s, backflips and front flips. There are several disciplines of mountain biking besides downhill, including: cross country (often referred to as XC), all mountain, trail, free ride, and newly popular enduro.
In 2020, due to COVID-19, mountain bikes saw a surge in popularity in the US, with some vendors reporting that they were sold out of bikes under US$1000.
Racing
Bicycle racing in 1909.
Shortly after the introduction of bicycles, competitions developed independently in many parts of the world. Early races involving boneshaker style bicycles were predictably fraught with injuries. Large races became popular during the 1890s "Golden Age of Cycling", with events across Europe, and in the U.S. and Japan as well. At one point, almost every major city in the US had a velodrome or two for track racing events, however since the middle of the 20th century cycling has become a minority sport in the US whilst in Continental Europe it continues to be a major sport, particularly in the United Kingdom, France, Belgium, Italy and Spain. The most famous of all bicycle races is the Tour de France. This began in 1903, and continues to capture the attention of the sporting world.
In 1899, Charles Minthorn Murphy became the first man to ride his bicycle a mile in under a minute (hence his nickname, Mile-a-Minute Murphy), which he did by drafting a locomotive at New York's Long Island.
As the bicycle evolved its various forms, different racing formats developed. Road races may involve both team and individual competition, and are contested in various ways. They range from the one-day road race, criterium, and time trial to multi-stage events like the Tour de France and its sister events which make up cycling's Grand Tours. Recumbent bicycles were banned from bike races in 1934 after Marcel Berthet set a new hour record in his Velodyne streamliner (49.992 km on 18 November 1933). Track bicycles are used for track cycling in Velodromes, while cyclo-cross races are held on outdoor terrain, including pavement, grass, and mud. Cyclocross races feature man-made features such as small barriers which riders either bunny hop over or dismount and walk over. Time trial races, another form of road racing require a rider to ride against the clock. Time trials can be performed as a team or as a single rider. Bikes are changed for time trial races, using aero bars. In the past decade, mountain bike racing has also reached international popularity and is even an Olympic sport.
Professional racing organizations place limitations on the bicycles that can be used in the races that they sanction. For example, the Union Cycliste Internationale, the governing body of international cycle sport (which sanctions races such as the Tour de France), decided in the late 1990s to create additional rules which prohibit racing bicycles weighing less than 6.8 kilograms (14.96 pounds). The UCI rules also effectively ban some bicycle frame innovations (such as the recumbent bicycle) by requiring a double triangle structure.
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