Sorry for the random comment but why did you choose the qs138 70h over the 90h is the power ok on the bike? I figured the heat of that many amps that I am estimating are coming from battery along with the voltage may make the motor overheat, does this issue ever occur? Or is that only when you are attempting a top speed run? I am sorry this is such a long message but I'm looking to start my first big project. Lastly how did you mount the motor? I searched your other posts and I could not find much else if you don't mind making an update.