[bobkoure]

I've never used weights for motorcycle racing. You certainly don't need weight to get around a track (a bike's a camber-thrust turner and leans to balance side thrust, as well as to generate that thrust though camber - at least to the point where bits start dragging on the pavement, which is why a rider might move out of the saddle.) I've also never seen it for handicapping (as in minimum weight for a particular class). Might just be something I'm unaware of, though.