275/60R18 vs 285/60R18 tire size
285/60R18 vs 275/60R18, diameter
+1.5% taller
- Speedometer
- 59.1 mph
- At a true 60 mph
- Diameter
- 31.46 in
- Was 30.99 in
- Revs per mile
- 641
- Was 651
- 3% guideline
- Within
Car built for 275/60R18, now on 285/60R18.
275/60R18 and 285/60R18
| Measure | 275/60R18 | 285/60R18 | Difference |
|---|---|---|---|
| Width, mm | 275 | 285 | +10 |
| Sidewall, % of width | 60 | 60 | 0 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 6.50 | 6.73 | +0.24 |
| Diameter, in | 30.99 | 31.46 | +0.47 (+1.5%) |
| Circumference, in | 97.4 | 98.8 | +1.5 |
| Revs per mile | 651 | 641 | -10 (-1.5%) |
Fitting 285/60R18 instead of 275/60R18
Within the usual 3% diameter guideline.
Cars with 275/60R18
Cars with 285/60R18
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