Triumph 650cc and 750cc Twins

The unit-construction 650cc Triumph 'B' series twins were the top-of-the-range models in Triumph's range from their introduction in 1963 through to the introduction of the 750cc Trident in 1968. The model range outlived the Trident, grew to 750cc in 1973 and eventually went out of production in the late 1980s.