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If you are going to change tire size and then trying to use the odometer or speedo (w/o recalibration) is silly.
You have to calibrate for the difference in doing the math for mileage.
All of my posts concerning larger diameter tires are based on:
1. Garmin gps for true mileage
2. calibrated ScangaugeII
note: SGII is calibrated in the metric mode w/ gps in the metric mode. this gives a more accurate reading when switched back to miles.
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