235/65R18 vs 275/55R18 tire size
275/55R18 vs 235/65R18, diameter
-0.4% shorter
- Speedometer
- 60.2 mph
- At a true 60 mph
- Diameter
- 29.91 in
- Was 30.03 in
- Revs per mile
- 674
- Was 672
- 3% guideline
- Within
Car built for 235/65R18, now on 275/55R18.
235/65R18 and 275/55R18
| Measure | 235/65R18 | 275/55R18 | Difference |
|---|---|---|---|
| Width, mm | 235 | 275 | +40 |
| Sidewall, % of width | 65 | 55 | -10 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 6.01 | 5.95 | -0.06 |
| Diameter, in | 30.03 | 29.91 | -0.12 (-0.4%) |
| Circumference, in | 94.3 | 94.0 | -0.4 |
| Revs per mile | 672 | 674 | +3 (+0.4%) |
Fitting 275/55R18 instead of 235/65R18
Within the usual 3% diameter guideline.
- 40 mm wider. Check rubbing at full lock.
Cars with 235/65R18
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