Triumph / BSA Drive Side Crankshaft Roller Bearing - 70-9974 - B25 / C25 / TR25W / B31 Wasp Also fits Triumph and BSA

Also fits Triumph and BSA triples from 1968-1972 with the 4-speed transmission

70-70140 or 70-7400

We stock a few types of these clamp-on mirrors

A "Modern" part to replace your old Lucas rectifier

* New Top Quality Lucas Type Triumph & BSA Side Oil Cooler Amber Reflector

Triumph / BSA Drive Side Crankshaft Roller Bearing - 70-9974 - B25 / C25 / TR25W / B31 Wasp Also fits Triumph and BSANewley manufactured for 2026, Hepolite is now offering these beautifully made crankshaft roller bearings for many BSA unit and pre unit singles. Features a steel cage with 9 rollers Fits BSA Unit singles (C25, B25 & B44) from 1967 On. BSA B31 & B33 from 1949 1959. BSA B32 & B34 Competition from 1949 1957. Drive Side for M20 & M21 models from 1945 1957. Drive Side & Timing side on BSA B50 models from 1971 1972. Also fits Triumph TR25W Trophy drive side