In 1971 BSA/Triumph introduced a new frame. The oil tank is integrated in the thick centre tube. New model "conical" brakes, new front forks, new style headlamp and switches. Triumph 650/750 and BSA A65/A70 engines used identical cycle parts. In 1974 the conical hubs (and matching forks) disappeared and were replaced by disc brakes.OIL IN FRAME TYPE EXHAUSTS FRONT FORKS CONICAL HUB TYPE