Triumph's pre-unit twin-cyclinder motorcycles were produced from 1938 to 1962, with engine sizes of 350cc, 500cc and 650cc. Ridden both on the road and in competition , the bikes formed the basis for Triumph's success through the 1940s to the 1960s. With iconic names such as Speed Twin, Tiger 100, Trophy and Bonneville, the pre-unit Triumphs came as sports bikes and tourers. With their superb styling and reliable engines, there were a favourite both at home and abroad. Triumph Pre-Unit Twins looks at the history and development of these bikes, and describes the various models that make up the range. It gives a detailed technical analysis of each model. Interviews with past and present owners give riding impressions of the bikes both today and back in the 1960s.
Matthew Vale has been writing books on classic British motorcycles and cars since 2004. Now retired from his work as a Chartered IT Professional specializing in computer security, he is devoting his free time to classic car and bike restoration, writing classic motoring books and articles, and spending time with his wife and family. In the past he has run such diverse classic cars as a Triumph Spitfire Mark III, MGB, Triumph Stag, and a Lotus Elite. He also restores and rides classic bikes, including the Triumph Bonneville, Norton Commando and BSA Lightning. With a lifelong fascination for glass-fibre-bodied cars (stemming from early holiday jobs at various glass-fibre factories, and ownership of many rusty cars), he is currently carrying out a nut and bolt (and glass fibre) restoration of two Lotus Elan Plus 2s.