First they sent me an English-size 26" wheel (I live in Canada, and my bike wheels are 26" in diameter, not >27" as is the case in England) and it took quite a while for the replacement to arrive. When I installed the replacement wheel and the rest of the kit following their manuals, the motor seemed to be running backward when I pedalled with the power on. It even threw an experienced cyclist friend to the ground when he tried it. My friend has installed 2 other Swytch kits, and we spent a lot of time trying everything our combined bike repair experience suggested. The motorized wheel will not turn under its own power. I have asked for prepaid return shipping for the 2 large boxes, and for a refund, but nothing of consequence from them yet.