'Marymoor Velodrome Grand Prix Elite Women's Keirin Final 2012 Redmond Washington from RideITLikeUstoleIT!!! on Vimeo.
A keirin race is a mass-start race with 6-9[citation needed] sprint riders and a paced start. Riders draw lots to determine starting positions and start as the pacer (usually a motorcycle, a derny, or a tandem bicycle) approaches. The riders are required to remain behind the pacer, which starts at the deliberately slow speed of about 25 km/h, gradually increases in speed and leaves the track approximately 600–700 meters before the end, at a speed of about 50 km/h. The first cyclist to finish the race is the winner (sometimes finishing at 70 km/h). Keirin races are about 2 kilometers in length (eight laps on a 250m track, six laps on a 333m track, and five laps on a 400m track)
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