225/55R19 vs 285/40R20 tire size
285/40R20 vs 225/55R19, diameter
+0.8% taller
- Speedometer
- 59.5 mph
- At a true 60 mph
- Diameter
- 28.98 in
- Was 28.74 in
- Revs per mile
- 696
- Was 702
- 3% guideline
- Within
Car built for 225/55R19, now on 285/40R20.
225/55R19 and 285/40R20
| Measure | 225/55R19 | 285/40R20 | Difference |
|---|---|---|---|
| Width, mm | 225 | 285 | +60 |
| Sidewall, % of width | 55 | 40 | -15 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 4.87 | 4.49 | -0.38 |
| Diameter, in | 28.74 | 28.98 | +0.23 (+0.8%) |
| Circumference, in | 90.3 | 91.0 | +0.7 |
| Revs per mile | 702 | 696 | -6 (-0.8%) |
Fitting 285/40R20 instead of 225/55R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
- 60 mm wider. Check rubbing at full lock.
Cars with 225/55R19
Cars with 285/40R20
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