Seller notes

  BSA A50 A65 18T Gearbox Sprocket 1963-1972 PN# 68-3093     The gearbox, or countershaft sprocket is important as it connects the primary drive to the final drive. Gearbox sprockets are available in different sizes to accommodate varying needs and riding conditions. The 18 Tooth gearbox sprocket is compatible with the 5/8 x 3/8 530 chain. Changing to an 18t sprocket from a 19t will result in a lower gear ratio through all four gears. Made in the UK. The gearbox sprocket is fitted to the main...

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