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All else being equal, changing from 18 to 19 is only 5.5% increase in real speed vs. indicated speed. Most folks I see going to 19 on the front are also changing over to more aggressively treaded tires for off road. That type tire is a bit taller than stock, so might add another percent or portion thereof, all else being equal. Some folks are fitting tires with 100% aspect ratios so that can add a bit more actual to a speed indication, maybe 2 to 2.5mph at 50mph.
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