Motorsport is a popular spectator sport in Australia, although there are relatively few competitors compared to other sports due to the high costs of competing. The oldest motorsport competition in Australia is the Alpine Rally which was first staged in 1921 followed by the Australian Grand Prix, first staged in 1928. The most widely watched motorsport category is Supercars, especially at the Bathurst 1000. Other classes in Australia include Australian GT, Formula 3 and Formula Ford (open wheel racing), Superbikes, as well as various forms (cars and bikes) of speedway racing.