265/70R17 vs 285/60R18 tire size
285/60R18 vs 265/70R17, diameter
-0.4% shorter
- Speedometer
- 60.3 mph
- At a true 60 mph
- Diameter
- 31.46 in
- Was 31.61 in
- Revs per mile
- 641
- Was 638
- 3% guideline
- Within
Car built for 265/70R17, now on 285/60R18.
265/70R17 and 285/60R18
| Measure | 265/70R17 | 285/60R18 | Difference |
|---|---|---|---|
| Width, mm | 265 | 285 | +20 |
| Sidewall, % of width | 70 | 60 | -10 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 7.30 | 6.73 | -0.57 |
| Diameter, in | 31.61 | 31.46 | -0.14 (-0.4%) |
| Circumference, in | 99.3 | 98.8 | -0.4 |
| Revs per mile | 638 | 641 | +3 (+0.5%) |
Fitting 285/60R18 instead of 265/70R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- 20 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 265/70R17
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