Form of motorcycle racing in which cyclists compete on a closed course marked out over natural or simulated rough terrain.
Courses vary widely but must be 1.5–5 km (1–3 mi) in length, with steep inclines, hairpin turns, and mud. Motorcycles are grouped into classes according to engine displacement (e.g., 125-, 250-, 500-cc). It is probably the most physically demanding motorcycle sport.
Motocross racing
Kinney Jones