After thinking about it some more, the math really isn't too complicated.
Just measure the circumference of the factory tire (say 215/75/15), then
measure the circumference of the new tire. Divide the old by the new, and
that should give you a correction factor.
btw, circumference = 3.14 x diameter :)
'92 Dak CC 2wd 318 3.55
'84 GoldWing Interstate
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