1948 Triumph Speed Twin

Reader Contribution by The Motorcycle Classics Staff
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1948 Triumph Speed Twin

Country: Great Britain
Engine: Air-cooled vertical twin four stroke
Ignition: B.T.H. Magneto
Power Rating: 28bhp @ 6,000rpm
Bore x Stroke: 63mm x 80mm
Displacement: 498cc
Valves: Overhead, pushrod activated
Fuel System: Single Amal Type 6 carburetor
Transmission: Four speed
Suspension: Front telescopic forks rigid rear
Brakes: Front and rear drum
Weight: 365 lbs.
Top Speed: 75mph

Edward Turner’s revolutionary vertical twin only had a brief production period in the late 1930s when World War II intervened. Post-war, the Speed Twin reappeared in similar form with the exception of telescopic forks replacing the old-style girders. Maroon Speed Twins were used by the majority of police forces in Britain and were popular for their speed and flexibility.

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