285/30R19 vs 245/30R20 tire size
245/30R20 vs 285/30R19, diameter
+0.2% taller
- Speedometer
- 59.9 mph
- At a true 60 mph
- Diameter
- 25.79 in
- Was 25.73 in
- Revs per mile
- 782
- Was 784
- 3% guideline
- Within
Car built for 285/30R19, now on 245/30R20.
285/30R19 and 245/30R20
| Measure | 285/30R19 | 245/30R20 | Difference |
|---|---|---|---|
| Width, mm | 285 | 245 | -40 |
| Sidewall, % of width | 30 | 30 | 0 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 3.37 | 2.89 | -0.47 |
| Diameter, in | 25.73 | 25.79 | +0.06 (+0.2%) |
| Circumference, in | 80.8 | 81.0 | +0.2 |
| Revs per mile | 784 | 782 | -2 (-0.2%) |
Fitting 245/30R20 instead of 285/30R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
Cars with 245/30R20
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