Example: 265 / 70 R17
265=Tire Width     70=Aspect Ratio     17=Rim Diameter
Enter your stock tire size:
/ - R
Enter the new tire size:
/ - R
Enter a speedometer reading:
MPH



CALCULATED DATA:
Stock tire width is millimeters New tire width is millimeters
Stock tire aspect ratio is % New tire aspect ratio is %
Stock rim diameter is inches New rim diameter is inches
When your speedometer indicates MPH,
you would actually be traveling MPH
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