225/60R18 vs 245/55R18 tire size
245/55R18 vs 225/60R18, diameter
Same diameter
- Speedometer
- 60.0 mph
- At a true 60 mph
- Diameter
- 28.61 in
- Was 28.63 in
- Revs per mile
- 705
- Was 704
- 3% guideline
- Within
Car built for 225/60R18, now on 245/55R18.
225/60R18 and 245/55R18
| Measure | 225/60R18 | 245/55R18 | Difference |
|---|---|---|---|
| Width, mm | 225 | 245 | +20 |
| Sidewall, % of width | 60 | 55 | -5 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 5.31 | 5.31 | -0.01 |
| Diameter, in | 28.63 | 28.61 | -0.02 (-0.1%) |
| Circumference, in | 89.9 | 89.9 | -0.1 |
| Revs per mile | 704 | 705 | +0 (+0.1%) |
Fitting 245/55R18 instead of 225/60R18
Within the usual 3% diameter guideline.
- 20 mm wider. Check rubbing at full lock.
Cars with 225/60R18
Cars with 245/55R18
What this cannot tell you
Diameter within 3% is a common shop guideline, not a maker spec.
Load index, offset and clearance are not in this data.
- Two or more sources agree
- One source
- Model-level or estimate
- Sources differ