255/65R18 vs 275/60R18 tire size
275/60R18 vs 255/65R18, diameter
-0.2% shorter
- Speedometer
- 60.1 mph
- At a true 60 mph
- Diameter
- 30.99 in
- Was 31.05 in
- Revs per mile
- 651
- Was 650
- 3% guideline
- Within
Car built for 255/65R18, now on 275/60R18.
255/65R18 and 275/60R18
| Measure | 255/65R18 | 275/60R18 | Difference |
|---|---|---|---|
| Width, mm | 255 | 275 | +20 |
| Sidewall, % of width | 65 | 60 | -5 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 6.53 | 6.50 | -0.03 |
| Diameter, in | 31.05 | 30.99 | -0.06 (-0.2%) |
| Circumference, in | 97.6 | 97.4 | -0.2 |
| Revs per mile | 650 | 651 | +1 (+0.2%) |
Fitting 275/60R18 instead of 255/65R18
Within the usual 3% diameter guideline.
- 20 mm wider. Check rubbing at full lock.
Cars with 255/65R18
Cars with 275/60R18
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