In full: bicycle motocross (Show more) BMX, cycle sport in which participants ride bicycles that are specialized for performance on dirt tracks built with features such as rollers, jumps, and banked curves or that are specialized for stunt riding. BMX includes recreational and off-road riding as well as competitive BMX racing and BMX freestyle. BMX is represented in international events, including the Olympic Games and the X Games. The origins of BMX can be traced to the mid-1960s in southern California, where young riders built dirt courses on vacant lots and raced around them. The emergence of the sport was facilitated in part by the development ...(100 of 1016 words) Access the full article Help support true facts by becoming a member. Subscribe today!