Join Date: Nov 2003
Bikes: Leader home built hardtail, Diamondback Response
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Old school was 10 tooth. Then someone came up with the idea that 11 tooth would get less wear as with each revolution, the odd number of teeth would alternately engage, an inner chain plate and then an outer chain plate.
I have always assumed that it does not matter with regard to the number of rear gears that a bike has. I usually buy 11 tooth for all uses.
We are an empire. Use it wisely.