Charles Branch, December 22, 2012 (view all comments by Charles Branch)
All the formulas, for example; to figure out the relationship between tire size, final drive gear ratio and the appropriate engine speed (rpm) that I used with late 1960s-1970s vehicles. I would not make alterations from the maker's tire size recommendation on current automobiles with all the computer controls. This is for the gearhead concerned with carburetors, calculating the most efficient air and fuel flow.
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