Quote:
Originally Posted by cowboy1948
here is another good formula. tire diameter to calculate new gear ratio.
new tire dia divide by old tire dia times your current gear ratio equals your new gear ratio.
29.7 divide 28.7 times 3.27 equals new gear ratio of 3.38
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I can already tell you, just by looking at that forumula and not testing it, that it is incorrect. Going to a taller tire has the reverse effect that you mentioned. So putting a TALLER tire on your car is like going to a lesser gear.
I tried flip flopping the old tire diameter and new tire diameter, and it is still not accurate.