Internally the engine layouts were very similar with one small difference being a change from the traditional Triumph plunger type of oil pump to the more usual BSA geared pump. The C15 engine design was essentially copied from that of the Tiger Cub with the main change, apart from the increase in capacity, being the use of a vertically orientated cylinder rather than the forward leaning one on the Cub. With Edward Turner in charge, BSA introduced the 250 cc C15 in 1958 replacing the pre-unit C12. These were Triumph’s first unit construction motorcycles with combined engine and gearbox. Among the famous motorcycle designs attributed to Edward Turner, the smallest was the single cylinder, overhead valve 199 cc Triumph T20 Tiger Cub introduced in 1954, itself a slightly sportier version of the 149 cc Triumph T15 Terrier. BSA acquired Triumph Motorcycles in 1951 and in 1956 Edward Turner, Triumph’s chief design architect, had become Chief Executive of the BSA Automotive Group.
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