245/75R18 vs 275/70R18 tire size
275/70R18 vs 245/75R18, diameter
+2.1% taller
- Speedometer
- 58.8 mph
- At a true 60 mph
- Diameter
- 33.16 in
- Was 32.47 in
- Revs per mile
- 608
- Was 621
- 3% guideline
- Within
Car built for 245/75R18, now on 275/70R18.
245/75R18 and 275/70R18
| Measure | 245/75R18 | 275/70R18 | Difference |
|---|---|---|---|
| Width, mm | 245 | 275 | +30 |
| Sidewall, % of width | 75 | 70 | -5 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 7.23 | 7.58 | +0.34 |
| Diameter, in | 32.47 | 33.16 | +0.69 (+2.1%) |
| Circumference, in | 102.0 | 104.2 | +2.2 |
| Revs per mile | 621 | 608 | -13 (-2.1%) |
Fitting 275/70R18 instead of 245/75R18
Within the usual 3% diameter guideline.
- 30 mm wider. Check rubbing at full lock.
Cars with 245/75R18
Cars with 275/70R18
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