225/55R18 vs 245/50R18 tire size
245/50R18 vs 225/55R18, diameter
-0.4% shorter
- Speedometer
- 60.2 mph
- At a true 60 mph
- Diameter
- 27.65 in
- Was 27.74 in
- Revs per mile
- 730
- Was 727
- 3% guideline
- Within
Car built for 225/55R18, now on 245/50R18.
225/55R18 and 245/50R18
| Measure | 225/55R18 | 245/50R18 | Difference |
|---|---|---|---|
| Width, mm | 225 | 245 | +20 |
| Sidewall, % of width | 55 | 50 | -5 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 4.87 | 4.82 | -0.05 |
| Diameter, in | 27.74 | 27.65 | -0.10 (-0.4%) |
| Circumference, in | 87.2 | 86.9 | -0.3 |
| Revs per mile | 727 | 730 | +3 (+0.4%) |
Fitting 245/50R18 instead of 225/55R18
Within the usual 3% diameter guideline.
- 20 mm wider. Check rubbing at full lock.
Cars with 225/55R18
Cars with 245/50R18
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