235/40R18 vs 265/30R19 tire size
265/30R19 vs 235/40R18, diameter
-0.6% shorter
- Speedometer
- 60.3 mph
- At a true 60 mph
- Diameter
- 25.26 in
- Was 25.40 in
- Revs per mile
- 798
- Was 794
- 3% guideline
- Within
Car built for 235/40R18, now on 265/30R19.
235/40R18 and 265/30R19
| Measure | 235/40R18 | 265/30R19 | Difference |
|---|---|---|---|
| Width, mm | 235 | 265 | +30 |
| Sidewall, % of width | 40 | 30 | -10 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 3.70 | 3.13 | -0.57 |
| Diameter, in | 25.40 | 25.26 | -0.14 (-0.6%) |
| Circumference, in | 79.8 | 79.4 | -0.4 |
| Revs per mile | 794 | 798 | +4 (+0.6%) |
Fitting 265/30R19 instead of 235/40R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
- 30 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 235/40R18
Cars with 265/30R19
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