235/65 R18 Tire Size Dimensions

A 235/65 R18 tire has an overall diameter of approximately 737 mm (29.02 in) and is a standard fit on many crossover SUVs.

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How to use this tool

Enter tire width, aspect ratio and rim diameter in the fields above.
Results update instantly as you type — or click Calculate.
Read your overall diameter and the full breakdown beneath it.

Calculate the overall diameter and sidewall height of the 235/65 R18 tire size used on popular crossover SUVs.

Frequently asked questions

What does 205/55R16 mean?: 205 is the tire width in mm, 55 is the aspect ratio (sidewall as % of width), and 16 is the rim diameter in inches. Sidewall height = 205 × 0.55 = 112.75 mm.