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.
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The Miata.net Tire Size Calculator is the most popular application of this type on the net and is used by countless other web sites.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.
Note: Dimensions displayed are calculated using industry standard tire sizing specifications. Individual tires may deviate from these dimensions, and actual dimensions should be obtained from the manufacturer.
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!