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The few exceptions to this are Italian cycling equipment manufacturers Campagnolo and Cinelli, which received NJS certification for some components. [18] Exceptions to these rules include Girls' Keirin and Keirin Evolution. Girls' Keirin allows for a limited set of non-NJS tires, stems, saddles, and carbon-fiber frames and wheels. [19]
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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 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.
Keirin races involve up to 7 cyclists each (though the 2020 format has no races with more than 6). The cyclists follow a pace motorcycle for 3 laps (750 m); the motorcycle then pulls away and the cyclists race for another 3 laps.
The eight nations that qualify for the team sprint event may enter two cyclists each in the Keirin (as well as the individual sprint). The nations that qualify a cyclist through the individual sprint rankings may also enter that cyclist in the Keirin. Finally, seven places are allocated through the Keirin rankings. [2]
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.
Twenty-five cyclists competed in the Keirin. Chris Hoy (Great Britain) qualified directly by winning the Keirin at the 2008 UCI Track Cycling World Championships.He also won the event at the late 2007 World Cup event in Sydney, affording another position to qualifiers based on Union Cycliste Internationale (UCI) rankings.