Not Ranked
Bob, your right! I DID have it backward! .68 IS taller.
I originally was using this formula:
mph = (rpm x tire diameter) / (gear ratio x 336)
For "gear ratio" I used 1.68 and 1.80, which WILL result in misleading numbers! I THINK you should use the "rear end ratio" for "gear ratio". But that doesn't seem to work either!
See the "link" in my EDIT section for a great calculator!
Ernie
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