I don't know a lot about it, but Keirin racing is super highly regulated on the equipment side. Essentially everyone has to have the same bike, with there being

I don't know a lot about it, but Keirin racing is super highly regulated on the equipment side. Essentially everyone has to have the same bike, with there being only a handful of parts manufacturers that have to make everything conforming to a certain spec. https://en.wikipedia.org/wiki/Keirin https://en.wikipedia.org/wiki/Keirin