Road Racing World Championship Grand Prix is the premier championship of motorcycle road racing currently divided into three distinct classes: 125cc, 250cc (250cc will be replaced by the new Moto2, 600cc class in 2010), 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.