c1930 Triumph Model CTT 500cc Motorcycle
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Based on the commercial success of the Model P, Triumph began expanding its model range in the late 1920s, offering a mix of side-valve and overhead-valve machines ranging from the 277cc Model W to the high performance 500cc TT, inspired by Victor Horsman’s record breaking efforts at the Brooklands circuit. A development of the 350cc Model CO, a new overhead-valve single, catalogued as the CTT, was launched at the 1929 Olympia Show, featuring electric lighting. With a bore and stroke of 80mm by 90mm and featuring a detachable twin-port head, the 497.5cc motor developed 4.98 horsepower, while the gearbox was a three-speed box unit mated to a dry multi-plate clutch. Innovative features found on the Model CTT included twist grip controls for both the throttle and magneto advance and the bike was also notable for being the first to adopt the handlebar design proposed by the Standardization Committee of the Manufacturer’s Union. The frame itself was a typical cradle-type design, the front forks Triumph’s own centre spring girder-type with steering damper and adjustable shock absorbers. The Model CTT was met with real enthusiasm when placed on sale in 1930, proving a worthy addition to Triumph’s line-up but few survivors are still on the road today.