Not something you see every day. This 1956 Tribsa has the best of both worlds. Its a BSA frame with the far more powerful Triumph 650 twin engine. The reason this was done is the BSA A10 frame handled much better than the Triumph. The Triumph engine was far more powerful than the BSA so a Tribsa is born. As you can see this bike is in need of a full restoration. There are very few Tribsa’s around.