I am looking to add a motor to my Raleigh Rush Hour. I am concerned that my hub, which has a fixed gear and free wheel on opposite sides, will not support the chain ring necessary for the engine kits. I was thinking I may be able to use the fixed gear on my wheel, but I am not sure if there is enough clearance between my fixed gear and frame. Has anyone put an engine on a road bike? So far I have only seen mtn bikes and cruisers. If I stick with my ~13 tooth fixed gear that already exists on my rear hub, will a standard bicycle chain ring support the larger engine chain? Any help is much appreciated.