Triumph / BSA Drive Side Crankshaft Roller Bearing - 70-9974 - B25 / C25 / TR25W / B31

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Newley 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 roller s 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 from 1968-On. Please refer to your parts catalog for proper fitment. **Features** Manufactured by Hepolite O.E.M Part number is MRJA25, NF305, 24-0724, R325L or 70-9974 Show more