Re: [ElectricMotorcycles] Planetary Gear Reduction with Belt drive

[Mbachandz]

I found smaller 7/8 front sprockets at Grainger in standard motorcycle chain sizes. I went down from a 14t front to a 12t and like the results although I might have gone to a 10 or 11 tooth as the top speed is currently 72 MPH plus. Range by the way is 20 miles although I don't have a good steady state amp reading. My motor is an older ADC A89-4001 6.7" running 72 volts of YTs and my gear ratio is 12t/45t. I do have the ability to increase the size of the rear sprocket up to about 51 teeth so still some room to tune.   Please note. The standard industrial sprocket from Graigner requires modification in order to work with a standard motorcycle chain. Some folks just grind an approximate angle into the teeth, but I chose to take it to a machine shop which charged me $10 to do it right (both sides angle cut). The teeth are hardened steel so it takes a bit of effort to do it in your garage.   I am considering moving to a non O-Ring type chain to see if that improves things at all, but need some better instrumentation first.    Mike Bachand Denver Electric Vehicle Council (DEVC) Board Member, Web Administration and Newsletter Editor Kawasaki Ninja EV http://www.devc.org [EMAIL PROTECTED]