275/55R19 vs 255/55R20 tire size
255/55R20 vs 275/55R19, diameter
+0.4% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 31.04 in
- Was 30.91 in
- Revs per mile
- 650
- Was 652
- 3% guideline
- Within
Car built for 275/55R19, now on 255/55R20.
275/55R19 and 255/55R20
| Measure | 275/55R19 | 255/55R20 | Difference |
|---|---|---|---|
| Width, mm | 275 | 255 | -20 |
| Sidewall, % of width | 55 | 55 | 0 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 5.95 | 5.52 | -0.43 |
| Diameter, in | 30.91 | 31.04 | +0.13 (+0.4%) |
| Circumference, in | 97.1 | 97.5 | +0.4 |
| Revs per mile | 652 | 650 | -3 (-0.4%) |
Fitting 255/55R20 instead of 275/55R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
Cars with 275/55R19
Cars with 255/55R20
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