There is no dial giving front or rear ratio a numeric value. It is all done by tests and feel at various speeds and adjusting the knob to your liking. That way you dial your own car in based on its individual braking ability.
I just made sure that my ratio didn't cause the rear to come around on a full 4 wheel panic lockup. I use the Porterfield pads so it is necessary to make sure they are correctly "glazed" during the tests.
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