4x4OffRoads.com - 4x4 Off Road Calculator Use this program for calculations for your modifications project. It currently has three mini-calculators. Select your calculator by clicking on the various tabs. Tire Size Calculator Converting from metric tire size to the more common inches used in those larger 4-wheeling tires can be handy. New Gear Ratio Calculator When you get larger tires you have to lower the gear ratio to preserve fuel consump
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