Tyre Size Calculator helps you determine tyre size when you place larger wheels.

Enter the original tyre size and the new wheel size into the form below.

The calculator will make a list of optional tyre sizes for the new wheel.

Note:
The optional tyres have a diameter in the range of -3% to +4% of the difference between the outer tyre diameter and the wheel diameter (D-W). This formula is used by leading tyre manufacturers

Tyre interchangeability is not always possible, so be sure to consult your car manufacturer's manual before changing your tyres. This is for informative purposes only.