1955 Grand Prix motorcycle racing season
The 1955 Grand Prix motorcycle racing season was the seventh F.I.M. Road Racing World Championship Grand Prix season. The season consisted of eight Grand Prix races in five classes: 500cc, 350cc, 250cc, 125cc and Sidecars 500cc. It began on 1 May, with Spanish Grand Prix and ended with Nations Grand Prix in Italy on 4 September.
Geoff Duke (pictured in 1951) won his last 500cc World Championship title in 1955.
1954 Grand Prix motorcycle racing season
The 1954 Grand Prix motorcycle racing season was the sixth F.I.M. Road Racing World Championship Grand Prix season. The season consisted of nine Grand Prix races in five classes: 500cc, 350cc, 250cc, 125cc and Sidecars 500cc. It began on 30 May, with French Grand Prix and ended with Spanish Grand Prix on 3 October.
Geoff Duke (pictured in 1951) successfully defended his 500cc World Championship title in 1954.
Fergus Anderson (right) successfully defended his 350cc World Championship title in 1954.
Werner Haas successfully defended his 250cc World Championship title in 1954.