Supercross is a cycle racing sport involving specialized high-performance off-road motorcycles on constructed dirt tracks with steep jumps and obstacles. Compared to regular motocross, supercross tracks generally have much shorter straights and tighter turns. Professional supercross contest races are held almost exclusively in professional baseball and football stadiums.
The supercross season takes place during the winter and spring months, with races in a different city every weekend. There are 17 races in the AMA Supercross Championship schedule, normally beginning in Anaheim, California, and ending in Las Vegas, Nevada. The 250 cc class is split into two series, east and west. The 450 cc class has one large series with events across the US and Canada.