Tire & Wheel Calculators
Tire sizes in inches, comparisons, offsets and speedometer error.
Bolt Pattern CalculatorWheel PCD from a stud measurementSpeedometer Error CalculatorTrue speed after a tire size changeTire Diameter CalculatorOverall diameter from width/aspect/rimTire Size CalculatorDecode any metric tire sizeTire Size Comparison CalculatorCompare two tire sizes side by sideTire Size Conversion Calculator (Metric ↔ Inches)Metric ↔ inch tire size conversionWheel Offset CalculatorBackspacing and offset change between wheels