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Today keirin racing is regulated by the JKA Foundation. In 2011, the sum of bets placed on keirin races exceeded ¥600 billion (approximately US$5 billion), and the number of attendees in the races was approximately 4.9 million people. [5] Aspiring professional keirin riders in Japan compete for entrance into the Japan Keirin School.
The Keirin is a variant of the sprint in which a higher number (usually 6–8, or 9 in Japan) of sprinters compete in a very different format. Riders are paced in the early laps by (and are required to stay behind) a Derny motorcycle, which slowly increases the speed of the race from 25 km/h to about 50 km/h.
The keirin, a Japanese sprint with a paced start which has spread across the world, is a variation of motor-paced racing. A group of cyclists use a single pacer to get to speed and then sprint to the finish on their own.
The Japan Keirin Autorace Foundation, or JKA Foundation (Japanese: 財団法人 JKA, Zaidanhōjin JKA), is the regulating body for pari-mutuel keirin cycle racing and flat track motorcycle racing competitions in Japan.
In Japan, the keirin race format is a very popular betting sport. The sport is well-regarded, and riders are extensively trained through the Japanese Keirin School. [7]
The UCI Track Cycling World Championships – Men's keirin is the world championship Keirin event held annually at the UCI Track Cycling World Championships. It was first held at the 1980 championships in Besançon , France.
The UCI Track Cycling World Championships – Women's keirin is the women's world championship keirin event held annually at the UCI Track Cycling World Championships. It was first held at the 2002 championships in Copenhagen, Denmark. As of 2019, Anna Meares from Australia and Kristina Vogel from Germany share the most titles, with three each.
The Keirin races involve 6.5 laps of the track behind a pace-setter, followed by a 2.5 lap sprint to the finish. The tournament consisted of preliminary heats and repechages, a semi-finals round, and the finals. The heats and repechages narrowed the field to 12. The semi-finals divided the remaining 12 into six finalists.