These essential washer incorporate serrations to keep the axle from slipping forward, and also features tabs that keep the axle from rotating in the frame due to pedaling torque.
If you're using a Sturmey-Archer hub on a newer frame made for a wider axle, you need the HMW494 with 9.5 mm tabs instead.
The HMW155 with 7.9 mm tabs fits the narrow axle slots of bikes originally intended for Sturmey-Archer hubs.
Click here for a parts diagram of the Sturmey-Archer AW hub.
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