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    Tire size calibration

    i have a 2013 ford expedition and im planning to install 9.00 17R sand tire's which has a circum of 856 mm. my truck came with 275/55/R20 tires and im running 275/60/R20 for a year now and i felt a little difference when shifting and downshifting, so im assuming that im gonna need to calibrate...
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