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Jan Buchwald

Hi Richard
The book of the Scott (I have the “Latest edition”) page 58 have a list of the gearings.
As I read it, with a 19 tooth sprocket, 4,62 revolutions should give 1 wheel rev, where as a 20 tooth sprocket it is 4,40 rev per wheel rev
22 tooth means 4,00 rev per wheel rev.
And so on (on a wide ratio box).
Best wishes
Jan B