Tire Size Comparison
Compare two tire sizes side by side to see the differences in overall diameter, width, sidewall height, circumference, and speedometer error. Enter tire sizes in standard format (width/aspect ratio + rim diameter) to compare.
Inputs
Results
Tire 1 Diameter
26.74"
225/55R17
Tire 2 Diameter
26.68"
245/45R18
Diameter Difference
-0.06" (-0.2%)
Speedometer Error
-0.2%
At indicated 60 mph
Side-by-Side Comparison
| Metric | Tire 1 (225/55R17) | Tire 2 (245/45R18) | Difference |
|---|---|---|---|
| Width (in) | 8.86 | 9.65 | 0.79 |
| Sidewall (in) | 4.87 | 4.34 | -0.53 |
| Diameter (in) | 26.74 | 26.68 | -0.06 |
| Circumference (in) | 84.02 | 83.82 | -0.20 |
| Revs/Mile | 754 | 756 | 2 |