Triumph Speed Twin

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1939 Triumph Speed Twin
1939 Triumph Speed Twin

The Triumph Speed Twin was a 490cc, 4-stroke, street motorcycle manufactured by Triumph from 1937 through 1958.

The Speed Twin was the basis for all Triumph twins until the 1980s. Its four-speed transmission was a simple design that would be used in several Triumph models over the years.

  • 27 brake horsepower and tunable to 50 bhp for racing
  • Four-speed transmission in separate case
  • Top speed: 92 mph