Wheel-mounted speedo drive for speedo cables with retainer nut and square drive. Axle diameter 10mm. As there are various types of drive fitted to these machines, please check the product image to be sure you are ordering the correct item. The item pictured is the one you will receive. Attention should be paid to the mounting height (width of the drive between wheel and fork).The drive is smaller on this 32mm version than on the 29mm version and NOT secured by an additional circlip.