Tire size calculator

This service calculates various aspects of a tire given its size specification. Any number of tire sizes may be specified in the list. This calculator is useful for determining the difference in speedometer and odometer reading or gearing.

Supply the tire specifications

Tires are specified in the form 225/50R16. The first number is the width of the tire (section), the second number is the aspect ratio (profile), and the third number is the wheel diameter (rim size). The delimiter characters are not important. Specifications containing speed ratings are handled correctly, as well as TRX wheel sizes.

Enter your tire specifications one per line in the box.