A good answer pretty much requiers a little more data in the question. Fendered or fenderless? What dimension(s) are you looking for? Diameter? Anything from 16" to 20" would probably work with the right tire. Width? Anything from 6 to 12 would work with the right tire and fenders. Backspacing? Nobody can answer that one without knowing a lot of dimensions about your rear axle, body and fenders.