Giacomo Agostini, with 15 victories, has won the most world championships. 600cc bikes replaced the 250cc bikes in the 2010 season, with the class re-branded as Moto2. In 2002, 990cc bikes replaced the 500cc bikes and the class was renamed as MotoGP. The 350cc class was discontinued in 1982 two years later the 50cc class was replaced with an 80cc class, which was discontinued in 1989. Due to escalating costs that resulted in a number of manufacturers leaving the championship, the FIM limited the 50cc bikes to a single cylinder, the 125cc and 250cc bikes were limited to two cylinders and the 350cc and 500cc bikes were limited to four cylinders.

The 50cc class was introduced in the 1962 season. There were four classes when the championship started in 1949 500cc, 350cc, 250cc and 125cc. The Grand Prix Road-Racing World Championship was established in 1949 by the sport's governing body, the FГ©dГ©ration Internationale de Motocyclisme (FIM), and is the oldest motorsport World Championship. Classes that have been discontinued include 350cc and 50cc/80cc. Grand Prix motorcycle racing is the premier championship of motorcycle road racing, which has been divided into three classes since the 1990 season: 125cc, 250cc and MotoGP, with the addition of MotoE, an electric motorcycle class, in 2019. Giacomo Agostini, who won 15 motorcycle world championships

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