This section is devoted mainly to 350, 500, & 650/750 twins, from the 1940's up to the early 1970's. Many items are common to different models, and even occur on BSA's in the 1970's (the conical hub era). Some items will be found on Triumph singles. We have used original part numbers, as used in the Triumph parts books, as far as possible, to aid identification.
We cover the “pre-unit construction” models, both in rigid & swinging arm frames ("B-range"). Then there are the "C-range" 350 & 500cc unit construction twins, and the 650-750 unit construction twins.