Hard Dog Fabrication

Miata.net Tire Size Calculator
(older version)

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.

If you see this message, your browser does not support Java Applets and you will not see the Tire Calculator above. Instead, use the calculator below.

Tire Calculator is the property of Eunos Communications LLC. Unauthorized reproduction of this software is strictly prohibited and will be prosecuted to the fullest extent of the law. Please report unauthorized use of this software.


This calculator gives various tire measurements from standard tire size specifications. It will give several dimensions for the tires listed in both fields below. The output will also show the tire specs given in the "Tires to compare" field as a percentage difference from the tire spec in the "Stock size" field. If this description sounds confusing, then just ignore it and try the calculator. You'll get the idea quick enough!

Units: English Metric
Stock size:
Tires to compare:
Note: You may enter multiple tire specifications in the "Tires to Compare" box. The resulting output will be a table comparing all sizes to the stock size.
Example: 195/55-14, 205/50-15

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