Cycling which is also called bicycling or biking is a sport in which bicycles are used for competitions. There are different forms of bicycle racing which include road bicycle racing, cyclo cross, mountain bike racing, track cycling, BMX racing, bike trails and cycle speedway. Besides, two wheeled bicycles, cycling however also includes riding a unicycle, tricycle, quadracycle and other similar human powered vehicles. Cycling sport is very popular all over the world, especially in Europe. Some of the most devoted countries include Italy, Spain, Belgium, Germany, Denmark, France, Netherlands, and Switzerland. Even United States has international standing and also does Australia and UK.
Road bicycle racing consists of team and individual competition, and these races are contested in several ways. They range from one day road race and time trial multi stage events. Mountain bike racing are basically off-road races, and these races generally involves some degree of technical riding. Track races often take place on banked tracks or velodromes. Even BXM cycling racing takes place off-road. However, bike trial is basically a sport where riders navigate natural and man-made obstacles without putting down their foot, or "dabbing". Speedway cycle racing takes place on short outdoor dirt tracks, 70-90m in length.
As a sport, cycling is generally governed worldwide by the Union Cyclists Internationale and the International Human Powered Vehicle Association. However, professional sports cycling for transport and touring is sponsored on a European level by the European Cyclists’ Federation with concerned members from Great Britain and Japan. Different professional cycling tours are also organized where cyclist from different countries can take part. One of the most famous professional sports cycling tour is Tour de France. Another popular pro cycling tour also includes Grand Tours.
Professional cycle racing organizations and associations put some limitations on the bicycles that can be used in the races they sanction. The governing body of the international cycling sport, the Union Cyclists International created some additional rules which restricted racing bicycles weighing less than 6.8 kilometers. The Union Cyclists Internationale rules also effectively prohibited some bicycle frame innovations such as recumbent bicycle by requiring a double triangle structure.