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on a stock, 20t frt chainring... what sized rear sprocket would be best for trials??
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16t or something like that.
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18:15 is the 'normal' stock ratio, so you'd just need to do 15/18 = 0.833 * 20 = 16.666. Seem to remember 20:17 was the norm and it looks about right according to that.
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thanks mark :D