245/50R17 vs 215/50R18 tire size
215/50R18 vs 245/50R17, diameter
-0.7% shorter
- Speedometer
- 60.4 mph
- At a true 60 mph
- Diameter
- 26.46 in
- Was 26.65 in
- Revs per mile
- 762
- Was 757
- 3% guideline
- Within
Car built for 245/50R17, now on 215/50R18.
245/50R17 and 215/50R18
| Measure | 245/50R17 | 215/50R18 | Difference |
|---|---|---|---|
| Width, mm | 245 | 215 | -30 |
| Sidewall, % of width | 50 | 50 | 0 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 4.82 | 4.23 | -0.59 |
| Diameter, in | 26.65 | 26.46 | -0.18 (-0.7%) |
| Circumference, in | 83.7 | 83.1 | -0.6 |
| Revs per mile | 757 | 762 | +5 (+0.7%) |
Fitting 215/50R18 instead of 245/50R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- Shorter sidewall: 0.6 in less.
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