

Tire Size Calculator
ĀTo calculate overall tire diameter, you only need the size of the tire. The formula below will help you determine the tire diameter.
(Cross-Section width X 0.aspect ratio) X 2 / 25.4+
Wheel Diameter
=
Overall tire diameter (in inches)
For example, if the tire size is 225/50R 16 the equation will be implemented as follows:
(225 X 0.50) X 2 / 25.4+
16
=
24.85 inches