Several months ago I purchased a 350w geared rear hub kit from Ypedal. The transaction was seamless as Gaston is extremely easy to interact with. The kit arrived promptly, was well packaged and all components were provided including thumb and twist throttles so as to allow a choice. The original platform was a Mongoose Mastiff for my friend's granddaughter. We were going to make a front hub conversion with the rear hub since the spacing on the fat tire bmx bike was 135mm. However, eventually the kit was used as a rear hub conversion on a Mongoose Dolomite. It was necessary to bend the 205mm rear of the steel frame to accommodate the 135 hub and make a spacer in order to move the freewheel over about 1.5"' or so; all in all, pretty easy. Purchased a 36V, 15ah battery from Ping and a Luna Cycles bag and completed the assembly. Just want to say that the bike performed perfectly on its initial run. I needed to send Gaston a couple of emails over the course of the protracted project and he ALWAYS RESPONDED PROMPTLY AND COURTEOUSLY. THANK YOU, GASTON.