Tire Size Calculator - TireSizeComparison.online
Free professional tire size calculator and comparison tools. Calculate tire diameter, width, sidewall height, circumference, and revolutions per mile. Trusted by 150,000+ monthly users.
Free Tire Calculator Tools
Our comprehensive suite of tire calculators helps you make informed decisions about tire upgrades and replacements.
Tire Education Resources
Learn everything about tire sizes, ratings, and specifications with our expert guides.
How to Use the Tire Size Calculator
- Enter your tire size - Type your tire size in standard format (e.g., 225/45R17)
- View calculated dimensions - See diameter, width, sidewall height, and circumference
- Compare with other sizes - Use our comparison tool to see differences between sizes
- Check speedometer impact - Calculate how new tires affect your speedometer accuracy
Frequently Asked Questions
- What does tire size 225/45R17 mean?
- 225 is the tire width in millimeters. 45 is the aspect ratio (sidewall height as a percentage of width). R indicates radial construction. 17 is the wheel diameter in inches.
- How do I know if a different tire size will fit my car?
- Use our tire comparison tool to compare your current tire size with the new size. Generally, you want to stay within 3% of the original tire diameter to maintain accurate speedometer readings and proper vehicle handling.
- What is tire diameter and why does it matter?
- Tire diameter is the overall height of the tire when mounted. It affects speedometer accuracy, ground clearance, gear ratios, and odometer readings. Our calculator shows this in both inches and millimeters.