4 Lobe. Will suit BSA model groups B, C and M (M20 etc...) series from 1934 to 1954

Also used on W, J, and G series.

Also 1954 swing arm A-series BSA.

Essential during any re-build to help stop engine vibration

BSA Cush Drive Sleeve B C M Series M20 M21 1937-1954 15-1555

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