this post was submitted on 19 Jun 2023
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Environment
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Iirc the biggest reason they can be dangerous is that the dropouts (where the rear wheel mounts) were never designed to stand up to the torque of a hub motor. You can brace it with extra metal or stick with a low wattage motor and make them pretty safe.
https://www.ebikeschool.com/torque-arm-need-one/