High Quality Content by WIKIPEDIA articles! The 1972 Grand Prix motorcycle racing season was the 24th 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 April 30, with West German Grand Prix and ended with Spanish Grand Prix on September 23.