235/40R18 vs 275/35R18 tire size
275/35R18 vs 235/40R18, diameter
+0.7% taller
- Speedometer
- 59.6 mph
- At a true 60 mph
- Diameter
- 25.58 in
- Was 25.40 in
- Revs per mile
- 788
- Was 794
- 3% guideline
- Within
Car built for 235/40R18, now on 275/35R18.
235/40R18 and 275/35R18
| Measure | 235/40R18 | 275/35R18 | Difference |
|---|---|---|---|
| Width, mm | 235 | 275 | +40 |
| Sidewall, % of width | 40 | 35 | -5 |
| Rim, in | 18 | 18 | 0 |
| Section height, in | 3.70 | 3.79 | +0.09 |
| Diameter, in | 25.40 | 25.58 | +0.18 (+0.7%) |
| Circumference, in | 79.8 | 80.4 | +0.6 |
| Revs per mile | 794 | 788 | -5 (-0.7%) |
Fitting 275/35R18 instead of 235/40R18
Within the usual 3% diameter guideline.
- 40 mm wider. Check rubbing at full lock.
Cars with 235/40R18
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