Quote:
Originally Posted by GRutter
You would also need to consider 28-28 vs 30-31 (21" vs 19") wheel diameter, as the rolling diameter of the tire will have an impact on speed at any given RPM with the same ratio rear
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According to Lucas Classic Tires a 28/29 tire (4.40/4.50-21) is a ¼" taller than a 30/31 tire (4.75/5.00-19). I don't think you would see much impact.