I commute by bicycle now but am about to double my distance so am trying to add an engine to the mix! I like rack mounts over frame mounts for some unknown reason, but I like the cheapness of chinese engines... This could get ugly! My goal is to keep it pretty light and rideable without engine power. In the words of the late Mitch Hedburg "An escalator can never break: it can only become stairs. You would never see an Escalator Temporarily Out Of Order sign, just Escalator Temporarily Stairs. Sorry for the convenience." My motor bike will never break, it will just temporarily become a bike. No cruisers, choppers, or fat tires for me! That's where I stand. Nice to meet you!