Thanks. I was able to find some good precision torque arms on eBay from the UK. Most of the ones I tried didn't fit the 10mm axle flats tightly enough. A $20 fix. Too bad those geniuses at AddMotor couldn't figure this out. Torque arms notwithstanding, I wouldn't consider AddMotor products in...
Addmotor cuts quality corners. Unlike other bikes using a Bafang rear geared hub motor, Addmotor doesn't bother to include an axle torque arm! Just because they sell on Amazon, it doesn't mean it's a quality bike.
After riding my Motan 550 for 104 miles, the hub motor 'spun out' of soft aluminum rear dropouts on the frame. Addmotor rejected my warranty claim because I had changed the tires. Use caution when doing business with these fine folks. There are better choices in bikes, like Rad Rover.
"Thanks...