Tire Size Calculator

Compare tire sizes and calculate diameter and speedometer difference.

Width mm

Aspect Ratio

Wheel Diameter in

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Guides & Reference

How It Works

Compare tire sizes and calculate diameter and speedometer difference. Enter your values and press Calculate for instant results with a full formula breakdown.

Formula

Tire diameter from size code

Quick Reference

Common calculations — results you can verify instantly.

205/55R16

205mm, 55%, 16in rim

OD≈24.9 inches

225/65R17

225mm, 65%, 17in rim

OD≈28.5 inches

265/70R17

Truck/SUV size

OD≈31.6 inches

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