Use this simple, effective torque arm on almost any rear hub motor installation. Use two of these if you're using a lot of power.
"GRIN Universal Rear Torque Arm, thick 1/4 inch stainless steel.
- Fits both 12 and 14mm axles.
- For mounting on rear dropouts
- 2 - 3 hoseclamp design for extra security
- Made with thick 1/4 inch stainless steel
For more information please see the torque arm page." at Grin Tech's website.
^ Above information is provided by Grin Tech, the manufacturer.