275/70R18 vs 285/65R18 tire size
285/65R18 vs 275/70R18, diameter
-1.7% shorter
- Speedometer
- 61.1 mph
- At a true 60 mph
- Diameter
- 32.59 in
- Was 33.16 in
- Revs per mile
- 619
- Was 608
- 3% guideline
- Within
Car built for 275/70R18, now on 285/65R18.
275/70R18 and 285/65R18
| Measure | 275/70R18 | 285/65R18 | Difference |
|---|---|---|---|
| Width, mm | 275 | 285 | +10 |
| Sidewall, % of width | 70 | 65 | -5 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 7.58 | 7.29 | -0.29 |
| Diameter, in | 33.16 | 32.59 | -0.57 (-1.7%) |
| Circumference, in | 104.2 | 102.4 | -1.8 |
| Revs per mile | 608 | 619 | +11 (+1.8%) |
Fitting 285/65R18 instead of 275/70R18
Within the usual 3% diameter guideline.
Cars with 275/70R18
Cars with 285/65R18
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