List of Grand Prix motorcycle racing World champions

List Of Grand Prix Motorcycle Racing World Champions

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 2010, in order of year and engine displacement.

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 600 cc engines in the first two years, after which they were replaced by 500cc engines. In 1979 the FIM created a prototype sidecar class named B2B, as opposed to the traditional B2A. Prototypes were banned in 1980, but from 1981 onwards prototypes were allowed again, this time without having a separate class.

Riders' World Championship

The Riders' World Championship is awarded to the most successful rider over a season, as determined by a points system based on Grand Prix results. The constructors listed in this table are the bike that the world champions rode during that winning season and are not necessarily the winner of the constructor's world championship in that season. For sidecar champions, the...
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