225/60R17 vs 215/55R18 tire size
215/55R18 vs 225/60R17, diameter
-1.2% shorter
- Speedometer
- 60.7 mph
- At a true 60 mph
- Diameter
- 27.31 in
- Was 27.63 in
- Revs per mile
- 738
- Was 730
- 3% guideline
- Within
Car built for 225/60R17, now on 215/55R18.
225/60R17 and 215/55R18
| Measure | 225/60R17 | 215/55R18 | Difference |
|---|---|---|---|
| Width, mm | 225 | 215 | -10 |
| Sidewall, % of width | 60 | 55 | -5 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 5.31 | 4.66 | -0.66 |
| Diameter, in | 27.63 | 27.31 | -0.32 (-1.2%) |
| Circumference, in | 86.8 | 85.8 | -1.0 |
| Revs per mile | 730 | 738 | +9 (+1.2%) |
Fitting 215/55R18 instead of 225/60R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- Shorter sidewall: 0.7 in less.
Cars with 225/60R17
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