215/55R17 vs 215/50R18 tire size
215/50R18 vs 215/55R17, diameter
+0.6% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 26.46 in
- Was 26.31 in
- Revs per mile
- 762
- Was 767
- 3% guideline
- Within
Car built for 215/55R17, now on 215/50R18.
215/55R17 and 215/50R18
| Measure | 215/55R17 | 215/50R18 | Difference |
|---|---|---|---|
| Width, mm | 215 | 215 | 0 |
| Sidewall, % of width | 55 | 50 | -5 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 4.66 | 4.23 | -0.42 |
| Diameter, in | 26.31 | 26.46 | +0.15 (+0.6%) |
| Circumference, in | 82.7 | 83.1 | +0.5 |
| Revs per mile | 767 | 762 | -4 (-0.6%) |
Fitting 215/50R18 instead of 215/55R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
Cars with 215/55R17
Cars with 215/50R18
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