To add to that, don't use the speedometer to gauge if you have the right tire size or you will be chasing numbers all over ther place; you should be comparing odometer to your GPS' trip mileage counter. There are different ways you can make it work or you, but you will find it is much more accurate and easier to know if you need to go up or down on tire circumference. If my GPS is clicking off tenths faster than my truck odo, I need to raise my tire size...if my truck odo is ticking out faster than the GPS, I lower the number. So far on Toyo MT 35x12.50-20's at 43 psi I found that 2702 is about as close as I'm going to get.
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