I just installed the subject kit on a Specialized rigid MTB. The service and response to questions from the supplier was excellent. The rear wheel with tire, tube and freewheel weighed 18 pounds, the 30 amp controller and other kit items about two pounds and the complete bike with lots of bling (Ritchey full carbon fork, titanium seatpost, titanium railed saddle, superlight front wheel with DT 240 hub, etc 38 pounds. The bike went 34 mph @ 52V on a bike stand and, so far, 30 mph on the road (175 pound rider). The speed measurements were with the supplied display, so ??? I'll do a top speed run some day, but 30 is all I'm comfortable on this bike. This was the smoothest motor I've had in eight years of building bikes for myself and others and testing scores of them.