Wheel Size Calculator app for iPhone and iPad

Tire size calculator. Calculates general data - tire width / height, speed difference and ground clearance. Metric and imperial sizes.

Comparison between original and replacement tire

Compare tire and wheel specs conveniently and get recommendations for tire and wheel upgrades. Support both Imperial and Metric units.

What makes this app standing out from the crowd: calculate approximate equivalent sprung (chassis) weight difference after changing to a new set of tire+wheel.

Use the calculator to see what happens to your speedometer reading when you change the size of your tires and wheels. This app is designed to help those of you who want to change the size of your wheels and/or tires. Hopefully, it will help you to sort through the seemingly infinite number of wheel and tire combinations.