1908 Triumph Roadster

1908 Triumph Roadster

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Triumph’s 1908 Roadster represented a development of the 1906 model, on which the renowned rocking front forks were introduced. The 1906 model featured a 398cc, 3hp, single-cylinder, side-valve engine with single-speed belt drive and the choice of coil or magneto ignition. That year, the remaining stocks of 293cc J.A.P. engines were also listed but the 398cc marked the launch of Triumph’s own engine.

Triumph’s first engine featured the first use of ball-bearing main bearings and was equipped with a mechanically-operated exhaust valve when most competitors were still using atmospheric valves. The valve movement was achieved using tracks machined into the timing gears which meshed with a pinion on the end of the crankshaft. In 1907, the engine’s capacity was increased to 453cc and rated at 3½hp but it was available only with magneto ignition. At the first Isle of Man Tourist Trophy race in 1907, Jack Marshall and Frank Hulbert finished second and third, respectively, in the single cylinder class on Triumphs. In 1908 the engine capacity was increased again to 476cc, while still rated at 3½hp, and the model was the first offered with a ‘free engine’ clutch.

A special TT Model was also produced which went on to win the 1908 class, setting a new lap record at 42.8mph (68.9kph) and marking the first victory by a motorcycle with both its frame and engine built by the same manufacturer. Triumph also produced its own carburettor. The TT model, which had no pedals because pedals had been banned at the TT, was not available for general sale until 1909.

This 1908 Roadster was purchased for the NZ Classic Motorcycles collection in November, 2009. It features acetylene lighting, a bulb horn and a tyre pump with attachment fittings. It was acquired by Transport World in May 2016.

• Maker
  Triumph
• Date Made
  1908
• Object number
  CMM294