These photos are from the flick photostream of y.hayama, taken on a trip to the Hakodate Keirin Velodrome located in Hakodate (City), Oshima (Subprefecture), Hokkaido (Prefecture), Japan.
This article gives an overview of Keirin racing at Hakodate. This is a Chicago bike tourist's report on the races.
The monocolored outfits look much better IMO than the multicolored, frenzied NASCAR-sticker-crazed kits the European bike teams are wearing.
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Check out the Big Guns
Look at the leg muscles on this rider: