235/55R17 vs 215/55R18 tire size
215/55R18 vs 235/55R17, diameter
+0.5% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 27.31 in
- Was 27.18 in
- Revs per mile
- 738
- Was 742
- 3% guideline
- Within
Car built for 235/55R17, now on 215/55R18.
235/55R17 and 215/55R18
| Measure | 235/55R17 | 215/55R18 | Difference |
|---|---|---|---|
| Width, mm | 235 | 215 | -20 |
| Sidewall, % of width | 55 | 55 | 0 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 5.09 | 4.66 | -0.43 |
| Diameter, in | 27.18 | 27.31 | +0.13 (+0.5%) |
| Circumference, in | 85.4 | 85.8 | +0.4 |
| Revs per mile | 742 | 738 | -4 (-0.5%) |
Fitting 215/55R18 instead of 235/55R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
Cars with 215/55R18
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