I have two identical appearing Shengyi 36V, 350w front hub motors built with identical spokes and 26" rims. Operating them with a 15 amp controller and 36V, 17.5 a-h battery, highest PAS level, one goes 23.1 mph and one 20.1 mph on the stand (no load), so apparently different winds. I a$$ume the "slower" one should have better hill climbing prowess. Correct?