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🚗 Tire Size Calculator

Calculate tire dimensions and compare sizes

🔵 Original Tire
🟠 New Tire

📋 Load Index / Speed Rating Lookup

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Select a load index to see the max load capacity
Select a speed rating to see the max speed

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Free online tire size calculator. Enter tire specs (width, aspect ratio, rim diameter) to calculate overall diameter, circumference, sidewall height, and revolutions per km. Compare original and new tires with diameter difference, speedometer deviation, and safety assessment. Includes common tire presets, load index, and speed rating lookup. Perfect for tire replacement and upgrade decisions.