[Edit: I'm not at all trying to make this into an argument. I'm just trying to be friendly in explaining that it's not as simple as you want it to be. I agree, where they happen to be a workable solution, hub motors are a cleaner, and probably more efficient design.] Big picture = physics. Sometimes what seems great at first glance to a layman doesn't pan out in the real world. I assure you, there are very good reasons why no serious automobile or motorcycle manufacturer is pursuing hub motors for high speed vehicles.