Voilamart 500W kit on the base trek mtn bike. will do 25mph for about 20 miles....i ride it more than my moped and, recently, more than my nhx110
so its obviously cheap (except the indestructible hub motor). i already burned up a controller (RMA'ed a new one) but i found tutorials on how to adapt better ones. it needs a bigger battery and i can just buy one and then DIY the wire connections.
I'm really happy with it. Also, its the first *almost* new bicycle i have bought. im not used to cushy tires and seats.... now i cant go back to my road bike. (edited)