215/50R17 vs 215/45R18 tire size
215/45R18 vs 215/50R17, diameter
+0.6% taller
- Speedometer
- 59.6 mph
- At a true 60 mph
- Diameter
- 25.62 in
- Was 25.46 in
- Revs per mile
- 787
- Was 792
- 3% guideline
- Within
Car built for 215/50R17, now on 215/45R18.
215/50R17 and 215/45R18
| Measure | 215/50R17 | 215/45R18 | Difference |
|---|---|---|---|
| Width, mm | 215 | 215 | 0 |
| Sidewall, % of width | 50 | 45 | -5 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 4.23 | 3.81 | -0.42 |
| Diameter, in | 25.46 | 25.62 | +0.15 (+0.6%) |
| Circumference, in | 80.0 | 80.5 | +0.5 |
| Revs per mile | 792 | 787 | -5 (-0.6%) |
Fitting 215/45R18 instead of 215/50R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
Cars with 215/50R17
Cars with 215/45R18
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