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After you enter your vehicles tire size (using either a measured tire height or entering your tires P-Metric information) plus your vehicles rear end ratio, this calculator will display a chart indicating the speedometer gear set combination needed for an accurate speedometer reading in your vehicle.
P-Metric
(not required if you only know the overall diameter)
Section Width
Aspect Ratio
Rim Size
Overall diameter
(not required if you only know the P-Metric measurements)
inches
Rear end ratio
(in decimal format. EX: 3.73, 4.10, 3.42)
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