Just enter your vehicle info or tire size and up to 4 other sizes you want to compare it with. It then compares the tires selected giving all relevant info including speedometer error.
Quick and easy...
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The Following User Says Thank You to redneck For This Useful Post:
Pay attention to the 3% difference between REVS-per-MILE vesus the REVs numerically-derived from the tire's circumference...the result of tire rolling-diameter being slightly smaller (due to weight causing tire flattening at bottom) than tires simple measured diameter.