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A gearbox mainshaft high gear bearing for the BSA unit singles, equivalent to original part number 29-3857. This was also used on many other models and for Triumph was known as 57-0665 or 70-0814. Also fits the following models.

BSA 250cc C11G/C12 4 speed, C15/B40 Sports (1965-66), C15/B40 (1967-), 500cc B50 (1971-72), Triumph TR25/TR25W (1967-), 350cc Unit twins, 500cc Unit twins, Royal Enfield 350/500/700cc models.

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