The alternative to a Triton – the Norton framed equivalent of this machine – is a Triumph engine in a BSA frame. This looks like a duplex BSA A10 frame has been used instead of the Norton Featherbed commonly used for Tritons. BSA A65 frames were also commonly used. In 1973 the Triumph works at Meriden even experimented with using surplus A65 frames with 650 TR6 engines. A few ‘factory’ TriBSAs were built, but records are a little vague as to how many exist, as Triumph were in considerable financial difficulties by then.