AMA Supercross Championship
The AMA Supercross Championship is an American motorcycle racing series. Founded by the American Motorcyclist Association (AMA) in 1974, the AMA Supercross Championship races are held from January through early May. Supercross is a variant of motocross which involves off-road motorcycles on a constructed dirt track consisting of steep jumps and obstacles; the tracks are usually constructed inside a sports stadium. The easy accessibility and comfort of these stadium venues helped supercross surpass off-road motocross as a spectator attraction in the United States by the late 1970s.
Jeremy McGrath won 7 Premier Class AMA Supercross titles, earning him the nickname the "King of Supercross"
Ricky Carmichael dominated AMA Supercross throughout the mid 2000s, winning five titles
Motocross is a form of off-road motorcycle racing held on enclosed off-road circuits. The sport evolved from motorcycle trials competitions held in the United Kingdom.
A motocross rider coming off a jump
A Maico 360 cc with air-cooled engine and twin shock absorbers on the rear suspension
FIM Motocross World Championship
Motocross des Nations