
On a powerful hub-motor e-bike, a little steel brace called a torque arm locks the motor axle to your frame — without it, the motor's pull can spin the axle right out of the dropout. Cheap part, big safety win.
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On a powerful hub-motor e-bike, a little steel brace called a torque arm locks the motor axle to your frame — without it, the motor's pull can spin the axle right out of the dropout. Cheap part, big safety win.