my girlfriend rides an aerospoke for her rear wheel, and i put it on my bike every once in a while. it is kind of heavy but since its where your power is it doesnt really matter. it is maybe a fraction slower to get started from a dead standstill but that depends on how strong you are if its going to matter. they are fun to skid on and look sick while doing it. there is a a spot on the side of the hub where a wrench goes and everyonce in a while you have to tighten up the hub( not sure of the correct terminology). but thats the only problem weve had wth it. if you want one just do it. its just money, youll make more.