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I did this on my bike, something that i think works really well for anyone thinking about doing this requires 2 tools. 1 a old steak knife you don't want any more and a benzomatic torch heat up the knife to red hot with the torch and cut off the desired amount of plastic its like butter. finish...

I went down a tooth in the front on my bike it made a difference I could feel but I think I'm going to go up 2 in the rear for some more. if you decide to change the gear ratio i would suggest doing them both at the same time.