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1. The best evolution of the cycling form. Unlike just riding to get from point A to point B, BMX involves whatever you feel like adding. See a good driveway curb and bust out some air with style off of it. 2. A sport (bicycle motocross) which evolved from motocross racing (aka: dirt biking) which involves racing on a dirt track with berms and jumps on a bicycle. Two major sacntioning bodies exist today. The ABA (American Bicycle Association) and the NBL (National Bicycle League). 3. Usually a 20" (can be 24") wheeled bicycle designed to ride on dirt trails, jumps, street obstacles, or skateparks. Not a kids bike or dirt bike.
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