215/70R17 vs 235/60R18 tire size
235/60R18 vs 215/70R17, diameter
+0.9% taller
- Speedometer
- 59.5 mph
- At a true 60 mph
- Diameter
- 29.10 in
- Was 28.85 in
- Revs per mile
- 693
- Was 699
- 3% guideline
- Within
Car built for 215/70R17, now on 235/60R18.
215/70R17 and 235/60R18
| Measure | 215/70R17 | 235/60R18 | Difference |
|---|---|---|---|
| Width, mm | 215 | 235 | +20 |
| Sidewall, % of width | 70 | 60 | -10 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 5.93 | 5.55 | -0.37 |
| Diameter, in | 28.85 | 29.10 | +0.25 (+0.9%) |
| Circumference, in | 90.6 | 91.4 | +0.8 |
| Revs per mile | 699 | 693 | -6 (-0.9%) |
Fitting 235/60R18 instead of 215/70R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- 20 mm wider. Check rubbing at full lock.
Cars with 235/60R18
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