Brand new MCA speedo drive, although fitted once to check size on a c10 (never ran bike with it on, just checked fitment). Fits BSA c10 and c11 rigid, as well as other models. Ratio 2:1. Hole size is 3/4". Also have an in-tank original Smiths speedo listed which comes with original drive and other spares, and a bunch of other BSA parts - see other listings. Please study photos as they make up part of the description. BSA TRIUMPH ARIEL AJS MATCHLESS
