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@hugo7
Technically, the difference is the result of a complicated formula involving lots of fractions with large denominators, but as a first approximation the fraction you're interested in is ⅛, which is the distance the axle moves for each 1 tooth change in either sprocket or chainring in a fixed gear drivetrain with a chain pitch of ½, assuming no change in total chain length.[/quote]
So does that mean on a 3/32 cog it will be 1/2 of 3/32 of an inch?
ie 0.046875" or 1.190625mm?