AMA Supercross Championship
Supercross is a motorcycle racing sport involving off-road motorcycles on an artificially-made dirt tracks consisting of steep jumps and obstacles. Professional supercross contest races are held almost exclusively within professional baseball and football stadia.
Read more about AMA Supercross Championship: History, Competition, Arenacross, World Supercross Championship Winners By Year, AMA Supercross Championship Winners By Year