The following is a list of Grand Prix motorcycle racing FIM World Champions
, from 1949 to 2010, in order of year and engine displacement
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
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... Read More