255/65R18 vs 275/55R19 tire size
275/55R19 vs 255/65R18, diameter
-0.5% shorter
- Speedometer
- 60.3 mph
- At a true 60 mph
- Diameter
- 30.91 in
- Was 31.05 in
- Revs per mile
- 652
- Was 650
- 3% guideline
- Within
Car built for 255/65R18, now on 275/55R19.
255/65R18 and 275/55R19
| Measure | 255/65R18 | 275/55R19 | Difference |
|---|---|---|---|
| Width, mm | 255 | 275 | +20 |
| Sidewall, % of width | 65 | 55 | -10 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 6.53 | 5.95 | -0.57 |
| Diameter, in | 31.05 | 30.91 | -0.14 (-0.5%) |
| Circumference, in | 97.6 | 97.1 | -0.4 |
| Revs per mile | 650 | 652 | +3 (+0.5%) |
Fitting 275/55R19 instead of 255/65R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
- 20 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 255/65R18
Cars with 275/55R19
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