High Quality Content by WIKIPEDIA articles! The 1963 Grand Prix motorcycle racing season was the 15th F.I.M. Road Racing World Championship Grand Prix season. The season consisted of twelve Grand Prix races in six classes: 500cc, 350cc, 250cc, 125cc, 50cc and Sidecars 500cc. It began on May 5, with Spanish Grand Prix and ended with Japanese Grand Prix on November 10.