275/55R20 vs 285/50R20 tire size
285/50R20 vs 275/55R20, diameter
-2.2% shorter
- Speedometer
- 61.3 mph
- At a true 60 mph
- Diameter
- 31.22 in
- Was 31.91 in
- Revs per mile
- 646
- Was 632
- 3% guideline
- Within
Car built for 275/55R20, now on 285/50R20.
275/55R20 and 285/50R20
| Measure | 275/55R20 | 285/50R20 | Difference |
|---|---|---|---|
| Width, mm | 275 | 285 | +10 |
| Sidewall, % of width | 55 | 50 | -5 |
| Rim, in | 20 | 20 | 0 |
| Section height, in | 5.95 | 5.61 | -0.34 |
| Diameter, in | 31.91 | 31.22 | -0.69 (-2.2%) |
| Circumference, in | 100.2 | 98.1 | -2.2 |
| Revs per mile | 632 | 646 | +14 (+2.2%) |
Fitting 285/50R20 instead of 275/55R20
Within the usual 3% diameter guideline.
Cars with 275/55R20
Cars with 285/50R20
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