265/55R20 vs 285/50R20 tire size
285/50R20 vs 265/55R20, diameter
-0.8% shorter
- Speedometer
- 60.5 mph
- At a true 60 mph
- Diameter
- 31.22 in
- Was 31.48 in
- Revs per mile
- 646
- Was 641
- 3% guideline
- Within
Car built for 265/55R20, now on 285/50R20.
265/55R20 and 285/50R20
| Measure | 265/55R20 | 285/50R20 | Difference |
|---|---|---|---|
| Width, mm | 265 | 285 | +20 |
| Sidewall, % of width | 55 | 50 | -5 |
| Rim, in | 20 | 20 | 0 |
| Section height, in | 5.74 | 5.61 | -0.13 |
| Diameter, in | 31.48 | 31.22 | -0.26 (-0.8%) |
| Circumference, in | 98.9 | 98.1 | -0.8 |
| Revs per mile | 641 | 646 | +5 (+0.8%) |
Fitting 285/50R20 instead of 265/55R20
Within the usual 3% diameter guideline.
- 20 mm wider. Check rubbing at full lock.
Cars with 265/55R20
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