Top Automobile Tires
You can use these calculators to calculate tires size.
Tire Wheel Size Comparison Conversion Calculator - Metric Standard
Automobile Tire Wheel Size Comparison and Conversion Calculator.
Miata.net Tire Size Calculator
Use the calculator to see what happens to your speedometer reading when you change the size of your tires and wheels. The graphic shows your stock tire selection in an outline overlaid on your new tire selection.