245/75R18 vs 265/70R18 tire size
265/70R18 vs 245/75R18, diameter
+0.4% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 32.61 in
- Was 32.47 in
- Revs per mile
- 619
- Was 621
- 3% guideline
- Within
Car built for 245/75R18, now on 265/70R18.
245/75R18 and 265/70R18
| Measure | 245/75R18 | 265/70R18 | Difference |
|---|---|---|---|
| Width, mm | 245 | 265 | +20 |
| Sidewall, % of width | 75 | 70 | -5 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 7.23 | 7.30 | +0.07 |
| Diameter, in | 32.47 | 32.61 | +0.14 (+0.4%) |
| Circumference, in | 102.0 | 102.4 | +0.4 |
| Revs per mile | 621 | 619 | -3 (-0.4%) |
Fitting 265/70R18 instead of 245/75R18
Within the usual 3% diameter guideline.
- 20 mm wider. Check rubbing at full lock.
Cars with 245/75R18
Cars with 265/70R18
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