I bought the Panterra 500W "powerboard" several years back, and the rear wheel bearing, or something, is loose. Every revolution of the wheel causes the attached sprocket to wobble slightly and the chain tension to loosen and slacken as the wheel goes around.
Panterra went out of business as I understand. I'd like to buy a replacement 9" wheel assembly, including rear disc and sprocket. Even better, if I could find a 9" or 10" wheel with a lower # of teeth sprocket for higher speed. Anyone know a source?