I think John in CR was saying the Kelly motors are better. Look at this bad boy: http://kellycontroller.com/hub-motor-72 ... p-464.html
Rated at 6kw.
Wouldn't be hard to get a custom swing arm made up to fit the motor. You really want a custom swingarm (if not custom bike), as I personally think you would be crazy to rely on "torque plates" in a standard bike frame with one of these things, you really want something low to the ground, purpose designed, and with bolt pinching dropouts, like John in CRs bikes.
I was thinking though it would be cool to make a custom frame bike, low to the ground, with the triangle a paneled box to hold the lipo. Ever since I fitted up a mates trike with a 20" 2805 I have been keen to get a small diameter wheel bike going. A scooter hub would be awesome for throwing some insane power at.
I've just been having an in depth conversation with a meth addict and I feel his pain in a weird ebike junkie kinda way!
At least you can be confident Andy that your ebike habit won't have you chewing your own cheeks out, and almost certainly won't cause you to compulsively masturbate for hours on end, and lead you to blowing bar flys in back alleys..... Unless said barfly had a 5303 in a 20inch, then I might at least consider giving him a quick wristy.... maaaybe a quick blowie.....