235/80R17 vs 245/75R18 tire size
245/75R18 vs 235/80R17, diameter
+2.1% taller
- Speedometer
- 58.8 mph
- At a true 60 mph
- Diameter
- 32.47 in
- Was 31.80 in
- Revs per mile
- 621
- Was 634
- 3% guideline
- Within
Car built for 235/80R17, now on 245/75R18.
235/80R17 and 245/75R18
| Measure | 235/80R17 | 245/75R18 | Difference |
|---|---|---|---|
| Width, mm | 235 | 245 | +10 |
| Sidewall, % of width | 80 | 75 | -5 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 7.40 | 7.23 | -0.17 |
| Diameter, in | 31.80 | 32.47 | +0.67 (+2.1%) |
| Circumference, in | 99.9 | 102.0 | +2.1 |
| Revs per mile | 634 | 621 | -13 (-2.0%) |
Fitting 245/75R18 instead of 235/80R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
Cars with 245/75R18
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