Tire calculators
Calculators for tire size math: what a size code means in inches, how two sizes compare, how a size change affects your speedometer, and what load index and speed rating codes stand for.
CalculatorLoad index and speed ratingWhat 91V or 116T means in pounds and mph.CalculatorSpeedometer error calculatorIndicated vs actual speed after a tire size change.CalculatorTire size calculatorDiameter, width, sidewall and revs per mile from a size code.CalculatorTire size comparisonDiameter, width, speedometer and 3% check for two sizes.