245/70R18 vs 285/60R18 tire size
285/60R18 vs 245/70R18, diameter
-0.1% shorter
- Speedometer
- 60.1 mph
- At a true 60 mph
- Diameter
- 31.46 in
- Was 31.50 in
- Revs per mile
- 641
- Was 640
- 3% guideline
- Within
Car built for 245/70R18, now on 285/60R18.
245/70R18 and 285/60R18
| Measure | 245/70R18 | 285/60R18 | Difference |
|---|---|---|---|
| Width, mm | 245 | 285 | +40 |
| Sidewall, % of width | 70 | 60 | -10 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 6.75 | 6.73 | -0.02 |
| Diameter, in | 31.50 | 31.46 | -0.04 (-0.1%) |
| Circumference, in | 99.0 | 98.8 | -0.1 |
| Revs per mile | 640 | 641 | +1 (+0.1%) |
Fitting 285/60R18 instead of 245/70R18
Within the usual 3% diameter guideline.
- 40 mm wider. Check rubbing at full lock.
Cars with 245/70R18
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