Tire Size Calculator
Compare two tire sizes instantly. See diameter, width, speedometer difference and more.
| Dimension | Original | New | Diff |
|---|---|---|---|
| Overall Diameter | 31.61" | 33.83" | +2.22" |
| Width | 10.43" | 11.22" | +0.79" |
| Sidewall Height | 7.3" | 8.42" | +1.12" |
| Circumference | 99.29" | 106.28" | +6.99" |
| Revs/Mile | 638 | 596 | -42 |
| Rim Diameter | 17" | 17" | 0" |
All Tire Calculators
Free tools for comparing tire sizes, checking fitment, and finding the right tires for your vehicle.
Tire Size Calculator & Comparison
Compare two tire sizes side-by-side. See diameter, width, speedometer difference and more.
Tire Size to Inches Converter
Convert metric tire sizes to inches and vice versa. All dimensions in both formats.
Speedometer Correction Calculator
See how much your speedometer is off after changing tire sizes.
Tire Size by Vehicle Finder
Look up OEM tire sizes by make, model, and year. Find upgrade options.
Rim & Tire Fitment Calculator
Check which tire sizes fit your wheels based on width, diameter, and offset.
Gear Ratio & Tire Size Calculator
Calculate effective gear ratio and RPM at speed after a tire size change.
Motorcycle Tire Size Calculator
Compare motorcycle tire sizes with dimensions optimized for bike fitment.
Lift Kit & Tire Size Calculator
Find the max tire size for your lift height. Includes mod recommendations.
Tire Size Chart Generator
Interactive chart of all tire sizes for a given rim diameter.
Plus Size Calculator
Calculate plus-zero, plus-one, plus-two sizing. Bigger rims, same diameter.
How to Read Tire Size Numbers
100% Free
All calculators are free, no sign-up required.
Accurate Math
Industry-standard formulas verified for precision.
Mobile Ready
Use on your phone at the tire shop or garage.