( MotoGP ) Grand Prix motorcycle racing refers to the premier category of motorcycle road racing. It is divided into three distinct classes: 125 cc, 250 cc and MotoGP. Grand prix motorcycles are purpose-built racing machines that are neither available for general purchase nor can be legitimately ridden on public roads. This contrasts with the various production categories of racing, such as the Superbike World Championship, that feature modified versions of road-going motorcycles available to the public. A World Championship for motorcycle racing was first organized by the Federation Internationale de Motocyclisme (FIM) in 1949. The commercial rights are owned by Dorna Sports.Teams are represented by the International Road Racing Teams Association (IRTA) and manufacturers by the Motorcycle Sport Manufacturers Association (MSMA). Rules and changes to regulations are decided between the four entities, with Dorna casting a tie-breaking vote. In cases of technical modifications, the MSMA can unilaterally enact or veto changes by unanimous vote among its members.