So I have a question about a different kind of setup for a multi-speed bike. Suppose you were to buy a standard run of the mill kit from any one of the manufactures. Instead of mounting a separate sprocket on the rear wheel to run the motor to why not keep the standard bike chain on say the biggest or outermost chain ring and run a short chain from the motor to the middle chain ring. This would allow you to shift the rear gear cog through all seven different gears. Of course you would no longer use the chain ring shifter. Is there a problem with this setup that I am not seeing or would this be a semi-simple way to have a 7speed motorized bike?