You probably like me, are looking at all the different E.V.'s and seeing what's different on each members project. On mine the bike has 4 front chain wheels, 1 the outer front chain wheel is driven by the cyclone 720W motor, which I decided to mount in my own way as opposed to the conventional lower slung under the frame. The inner 3 front chain wheels are the std bike chain wheels. The trick was to bolt the original 3 chain wheels to the chain wheel supplied with the kit. This made a total of 4 chain wheels this enabled all the bikes original gearing.