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How did BMX racing develop from motocross?

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Olympic road cycling — cycling Individual Neutral Athlete Gleb Syritsa, a Russian passport holder, cycling past Les Invalides during the men's road cycling individual time trial at the Paris 2024 Olympic Games.

BMX racing emerged in the mid-1960s in southern California as young riders began building dirt tracks on vacant lots to mimic the experience of motocross racing. These early participants, often children, customized their bicycles—such as the Schwinn Sting-Ray—to be more maneuverable for off-road use, frequently imitating the sounds and maneuvers of motorcycles while riding.12

The sport’s development was significantly accelerated by the 1971 documentary film On Any Sunday, which featured scenes of children racing bicycles on dirt trails and performing jumps, effectively popularizing the activity across the United States. This cultural momentum led to the creation of formal infrastructure, including the construction of dedicated motocross-like tracks at public parks and the establishment of national sanctioning bodies like the National Bicycle Association (NBA) and the National Bicycle League (NBL) in the early 1970s. By 1974, organized national competitions were being held, eventually evolving into the professionalized sport that made its Olympic Games debut in 2008.12