Tire Size Calculator
Compare tire sizes and calculate diameter, circumference, and speedometer difference. Find compatible tire sizes for your vehicle.
How to Compare Tire Sizes
- 1 Enter your original tire size (width, aspect ratio, rim diameter)
- 2 Enter the new tire size you want to compare
- 3 Click to calculate and compare dimensions
- 4 Review diameter, circumference, and sidewall differences
- 5 Check speedometer error and fitment recommendation
🔒 Instant results, faster than AI. No signup. 100% private.
Last updated: January 15, 2026 · v2.1