235/60R20 vs 285/50R20 tire size
285/50R20 vs 235/60R20, diameter
+0.4% taller
- Speedometer
- 59.8 mph
- At a true 60 mph
- Diameter
- 31.22 in
- Was 31.10 in
- Revs per mile
- 646
- Was 648
- 3% guideline
- Within
Car built for 235/60R20, now on 285/50R20.
235/60R20 and 285/50R20
| Measure | 235/60R20 | 285/50R20 | Difference |
|---|---|---|---|
| Width, mm | 235 | 285 | +50 |
| Sidewall, % of width | 60 | 50 | -10 |
| Rim, in | 20 | 20 | 0 |
| Section height, in | 5.55 | 5.61 | +0.06 |
| Diameter, in | 31.10 | 31.22 | +0.12 (+0.4%) |
| Circumference, in | 97.7 | 98.1 | +0.4 |
| Revs per mile | 648 | 646 | -2 (-0.4%) |
Fitting 285/50R20 instead of 235/60R20
Within the usual 3% diameter guideline.
- 50 mm wider. Check rubbing at full lock.
Cars with 235/60R20
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