1978 Grand Prix motorcycle racing season

Sports season

1978 F.I.M. Grand Prix motorcycle racing season

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1978 World Champions
500cc – Kenny Roberts (Yamaha)
350cc - Kork Ballington (Kawasaki)
250cc – Kork Ballington (Kawasaki)
125cc – Eugenio Lazzarini (MBA)
50cc – Ricardo Tormo (Bultaco)

Kenny Roberts (pictured in Assen) became the 1978 500cc world champion

The 1978 Grand Prix motorcycle racing season was the 30th F.I.M. Road Racing World Championship season.