245/75R18 vs 285/65R18 tire size
285/65R18 vs 245/75R18, diameter
+0.4% taller
- Speedometer
- 59.8 mph
- At a true 60 mph
- Diameter
- 32.59 in
- Was 32.47 in
- Revs per mile
- 619
- Was 621
- 3% guideline
- Within
Car built for 245/75R18, now on 285/65R18.
245/75R18 and 285/65R18
| Measure | 245/75R18 | 285/65R18 | Difference |
|---|---|---|---|
| Width, mm | 245 | 285 | +40 |
| Sidewall, % of width | 75 | 65 | -10 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 7.23 | 7.29 | +0.06 |
| Diameter, in | 32.47 | 32.59 | +0.12 (+0.4%) |
| Circumference, in | 102.0 | 102.4 | +0.4 |
| Revs per mile | 621 | 619 | -2 (-0.4%) |
Fitting 285/65R18 instead of 245/75R18
Within the usual 3% diameter guideline.
- 40 mm wider. Check rubbing at full lock.
Cars with 245/75R18
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