List of Grand Prix motorcycle racing World Champions
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The following is a list of Grand Prix motorcycle racing FIM World Champions, from 1949 to 2007, in order of year and engine displacement.
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Engine formulas
At the end of the 1968 season, the FIM limited gearboxes to 6 speeds, 125 cc and 250 cc categories to no more than two cylinders and 350 cc and 500 cc categories to no more than four cylinders.
The 350 class was discontinued after the 1982 season. After the 1983 season, the 50 cc class was increased to 80 cc. After the 1989 season, 125 cc bikes were limited to single cylinder engines and the 80 cc class was discontinued.
In the 2002 season, 500 cc two-stroke engines were replaced with 990 cc four-stroke engines with as many as six cylinders. The engine capacity was reduced to 800 cc for the 2007 season.
Sidecars had 500 cc engines. Only the pilot is listed here, not the passenger. The significance of this class dropped after the 1950s, but races were held in connection with WC until the early 2000s.
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