A real necessity for any eBike conversion project. eBike electric hub motors spin a flatted axle against the bike frame. But bike frames/forks were not designed for this. The frame may eventually wear out and the axle will spin freely causing damage to the motor wiring. This is especially true if you "mod" your system for more power.
The solution is a "torque arm" that mounts securely around the flatted axle and attaches to the frame away from the center of the axle, giving it the torque needed to hold the motor axle securely. The strongest installations use one on each side.
These beefy arms are cut from 3 mm thick stainless steel. These fit most electric hub motor axles out there. In particular the 12mm fits Crystalyte 4 series motors and the 14 mm fits Crystalyte 5 series motors and BMC hub motors. These fit very snug, which is ideal, and due to varying tolerances some filing may be necessary to install on the axle. Additional hardware will be needed to secure the other end of the torque arm, such as a pipe clamp, u-bolt etc., which vary with the installation and are not provided. Price is per 1 torque arm, we have many in stock. We have 3 versions available:
- 12mm rear vertical dropout
- 14mm rear vertical dropout
- 14mm front fork or rear horizontal
In the rear, horizontal dropouts are the slots in the frame for the axle that are parallel to the ground. Single speeds and beach cruisers usuall use these. Vertical dropouts are the slots than are, well, vertical. Bikes with gears usually use these. Feel free to contact us if you have questions.
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