245/75R17 vs 285/60R18 tire size
285/60R18 vs 245/75R17, diameter
Same diameter
- Speedometer
- 60.0 mph
- At a true 60 mph
- Diameter
- 31.46 in
- Was 31.47 in
- Revs per mile
- 641
- Was 641
- 3% guideline
- Within
Car built for 245/75R17, now on 285/60R18.
245/75R17 and 285/60R18
| Measure | 245/75R17 | 285/60R18 | Difference |
|---|---|---|---|
| Width, mm | 245 | 285 | +40 |
| Sidewall, % of width | 75 | 60 | -15 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 7.23 | 6.73 | -0.50 |
| Diameter, in | 31.47 | 31.46 | 0 (-0.0%) |
| Circumference, in | 98.9 | 98.8 | -0.0 |
| Revs per mile | 641 | 641 | +0 (+0.0%) |
Fitting 285/60R18 instead of 245/75R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- 40 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.5 in less.
Cars with 245/75R17
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