A simple way to add strength to your front fork. But totally optional. Electric bike motors add additional stress on front forks. That is why we recommend steel forks, or adding a torque arm if using an aluminum or carbon fiber fork, or if your bike’s fork is really, really old. Torque arms are not required, but can offer a sense of security by adding increased strength to your bike’s hold on the axle and transporting some of the strain away from the drop outs.
Detailed installation instructions and more information is available here.