That’s why both fork ends and the wheel axles have two flat sides, to prevent the axle spin normally. Imagine what would happen if the axle could spin easily? Of course the bike would not go. When a hub motor powers up running, it generates some amount of power, torque to rotate the wheel forward so you can go and an equal torque applied to the axle to rotate it in the opposite direction of the wheel. Let’s get some idea about how a hub motor works. This may be a special concern for those who run hub motors on the front as front forks are usually weaker than the rear ones. When you convert your regular bike into an electric bicycle and install a high hub motor torque to forks/dropouts, more than a bike was designed for, it may not handle potential safety risks may arise for riders. They are not designed to resist wheel torque, their purpose is simply to hold the wheels in place. Regular bicycle forks are designed for lightweight wheels which do not apply nearly as much torque to the bicycle dropouts and forks compared to an ebike.
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