What's wrong with the motor? I actually have 2 extra hub motors. I bought 2 new takeoffs that were on US spec Cannondale Neo's so I could build my rear wheel while still retaining the factory wheel/hub assembly intact. Orbea and Mahle will try to tell you that the hubs are registered to the bike and another hub won't work blah blah blah. That's not accurate. The battery/controller assembly is the only component that's registered and electronically signatured. As long as the motor is the correct US or EU spec for your bike, the system works fine with a different hub motor.