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. Courtesy of http://www.miata.net/garage/tirecalc.html
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!
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