The 1978 British motorcycle Grand Prix was the tenth round of the 1978 Grand Prix motorcycle racing season. It took place on 5–6 August 1978 at Silverstone Circuit.

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  1978 British Grand Prix

Race details
Race 10 of 13 races in the 1978 Grand Prix motorcycle racing season
Date	6 August 1978
Official name	John Player British Grand Prix[1][2][3]
Location	Silverstone Circuit
Course	Permanent racing facility 4.711 km (2.927 mi)
500 cc
Pole position Rider Michel Rougerie Time 1:30.980 Fastest lap Rider Kenny Roberts Time 1:31.38 Podium First Kenny Roberts Second Steve Manship Third Barry Sheene
350 cc
Pole position Rider Kork Ballington Time 1:34.600 Fastest lap Rider Tom Herron Time 1:33.830 Podium First Kork Ballington Second Tom Herron Third Mick Grant
250 cc
Pole position Rider Kork Ballington Time 1:37.140 Fastest lap Rider Anton Mang Time 1:37.400 Podium First Anton Mang Second Tom Herron Third Raymond Roche
125 cc
Pole position Rider Eugenio Lazzarini Time 1:42.690 Fastest lap Rider Eugenio Lazzarini Time 1:42.220 Podium First Ángel Nieto Second Clive Horton Third Eugenio Lazzarini
Sidecar (B2A)
Pole position Rider Rolf Biland Time 1:38.190 Fastest lap Rider Rolf Biland Time 1:46.920 Podium First Alain Michel Second Rolf Biland Third Jock Taylor

Close

Kenny Roberts and Barry Sheene, the two championship contenders arrived in England for the British Grand Prix with only three points separating them.^[4] The race ended in controversy when torrential rains during the race, along with pit stops for tire changes by both Roberts and Sheene, created confusion among official scorers.^[5] Eventually, Roberts was declared the winner with Sheene being awarded third place behind privateer Steve Manship, who did not stop for a tire change.^[6][7][8]