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A Derny is a motorized bicycle for motor-paced cycling events such as during six-day and Keirin racing and motor-paced road races. Some riders train behind a derny on the road. The Derny is so-called as it was originally produced by the French Derny firm, but the name Derny is now applied to all small cycle-pacing vehicles, regardless of ...
For example, the bicycles frames used in Japanese Keirin races must be made from chromoly steel using traditional techniques like brazing, and wheels must have exactly 36 spokes per wheel. Popular frame manufacturers include Nagasawa , 3Rensho , Makino, Kalavinka, Level, Bridgestone , Panasonic , and Samson.
A Keirin bike is a track bike for Keirin races in Japan that meets the strict system of standards of the JKA Foundation (Japan Keirin Autorace Foundation), the governing body for Keirin competitions, still popular under the abbreviation of its predecessor body - NJS (Nihon Jitensha Shinkōkai or the Japanese Bicycle Association).
Matsuyama Keirin Velodrome Ehime: 500 m Japan: Matusaka Keirin Velodrome Mie: 400 m Japan: Moji Keirin Velodrome Fukuoka: 500 m Japan: Mukomachi Keirin Velodrome Kyoto: 400 m Japan: Nara Keirin Velodrome Nara: 333.33 m Japan: Nagoya Keirin Velodrome Aichi: 400 m Japan: Nejime Velodrome Kagoshima: 400 m Japan: Odawara Keirin Velodrome Kanagawa ...
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 bicycles used are optimized for track racing; they are fixed-gear bicycles without freewheel or brakes, with narrow tires inflated to high pressure. Frame and other components are designed for rigidity and lightness, to give maximum speed over the distance of the race (sprint or longer).
Prior to the JKA's founding, keirin races were overseen by the Nihon Jitensha Shinkōkai (Japanese: 日本自転車振興会, lit. Japan Bicycle Promotion Association), or Japan Keirin Association, often abbreviated NJS. Today the present JKA is responsible for fostering Japan's bicycle industry and regulating keirin racing in Japan.
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.
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