255/55R18 vs 235/55R19 tire size
235/55R19 vs 255/55R18, diameter
+0.5% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 29.18 in
- Was 29.04 in
- Revs per mile
- 691
- Was 694
- 3% guideline
- Within
Car built for 255/55R18, now on 235/55R19.
255/55R18 and 235/55R19
| Measure | 255/55R18 | 235/55R19 | Difference |
|---|---|---|---|
| Width, mm | 255 | 235 | -20 |
| Sidewall, % of width | 55 | 55 | 0 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 5.52 | 5.09 | -0.43 |
| Diameter, in | 29.04 | 29.18 | +0.13 (+0.5%) |
| Circumference, in | 91.2 | 91.7 | +0.4 |
| Revs per mile | 694 | 691 | -3 (-0.5%) |
Fitting 235/55R19 instead of 255/55R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
Cars with 255/55R18
Cars with 235/55R19
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