245/55R17 vs 225/55R18 tire size
225/55R18 vs 245/55R17, diameter
+0.5% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 27.74 in
- Was 27.61 in
- Revs per mile
- 727
- Was 730
- 3% guideline
- Within
Car built for 245/55R17, now on 225/55R18.
245/55R17 and 225/55R18
| Measure | 245/55R17 | 225/55R18 | Difference |
|---|---|---|---|
| Width, mm | 245 | 225 | -20 |
| Sidewall, % of width | 55 | 55 | 0 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 5.31 | 4.87 | -0.43 |
| Diameter, in | 27.61 | 27.74 | +0.13 (+0.5%) |
| Circumference, in | 86.7 | 87.2 | +0.4 |
| Revs per mile | 730 | 727 | -4 (-0.5%) |
Fitting 225/55R18 instead of 245/55R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
Cars with 225/55R18
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