255/50R19 vs 235/50R20 tire size
235/50R20 vs 255/50R19, diameter
+0.7% taller
- Speedometer
- 59.6 mph
- At a true 60 mph
- Diameter
- 29.25 in
- Was 29.04 in
- Revs per mile
- 689
- Was 695
- 3% guideline
- Within
Car built for 255/50R19, now on 235/50R20.
255/50R19 and 235/50R20
| Measure | 255/50R19 | 235/50R20 | Difference |
|---|---|---|---|
| Width, mm | 255 | 235 | -20 |
| Sidewall, % of width | 50 | 50 | 0 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 5.02 | 4.63 | -0.39 |
| Diameter, in | 29.04 | 29.25 | +0.21 (+0.7%) |
| Circumference, in | 91.2 | 91.9 | +0.7 |
| Revs per mile | 695 | 689 | -5 (-0.7%) |
Fitting 235/50R20 instead of 255/50R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
Cars with 255/50R19
Cars with 235/50R20
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