In article ,
Don Foreman wrote:

Using your ratio of 1 : 6.1245 = 0.16304, 15/92 is a good match.

I might have known you'd be the one to figure it out. Surely you didn't just
guess this ratio. How'd you do it?

A slide rule is an amazing tool for guessing gear ratios ratios, just
set up the ratio and look across the slide for matching integers

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