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Calculate Tire Diameter & Section Width


Tire width (mm):     Aspect ratio:     Wheel size (inches):


Tire diameter (inches) =

Tire section width (inches) =

Tire sidewall (inches) =

Tire circumference (inches) =


This calculator will calculate an estimated tire diameter (height) from the standard information given on the sidewall: width, aspect ratio, and wheel size.
Actual tire sizes vary by manufacturer.
The stock 93 RX-7 tires were 225/50/16 (225mm section width, 50% aspect ratio, 16 inch wheel).
See the Wheel Offset Diagram for an explanation of section width.
See my Free Android Drag Racing Calculator App in the Google Play Store
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