235/65R18 vs 255/60R18 tire size
255/60R18 vs 235/65R18, diameter
Same diameter
- Speedometer
- 60.0 mph
- At a true 60 mph
- Diameter
- 30.05 in
- Was 30.03 in
- Revs per mile
- 671
- Was 672
- 3% guideline
- Within
Car built for 235/65R18, now on 255/60R18.
235/65R18 and 255/60R18
| Measure | 235/65R18 | 255/60R18 | Difference |
|---|---|---|---|
| Width, mm | 235 | 255 | +20 |
| Sidewall, % of width | 65 | 60 | -5 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 6.01 | 6.02 | +0.01 |
| Diameter, in | 30.03 | 30.05 | +0.02 (+0.1%) |
| Circumference, in | 94.3 | 94.4 | +0.1 |
| Revs per mile | 672 | 671 | -0 (-0.1%) |
Fitting 255/60R18 instead of 235/65R18
Within the usual 3% diameter guideline.
- 20 mm wider. Check rubbing at full lock.
Cars with 235/65R18
Cars with 255/60R18
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