255/45R19 vs 285/35R20 tire size
285/35R20 vs 255/45R19, diameter
-0.6% shorter
- Speedometer
- 60.4 mph
- At a true 60 mph
- Diameter
- 27.85 in
- Was 28.04 in
- Revs per mile
- 724
- Was 719
- 3% guideline
- Within
Car built for 255/45R19, now on 285/35R20.
255/45R19 and 285/35R20
| Measure | 255/45R19 | 285/35R20 | Difference |
|---|---|---|---|
| Width, mm | 255 | 285 | +30 |
| Sidewall, % of width | 45 | 35 | -10 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 4.52 | 3.93 | -0.59 |
| Diameter, in | 28.04 | 27.85 | -0.18 (-0.6%) |
| Circumference, in | 88.1 | 87.5 | -0.6 |
| Revs per mile | 719 | 724 | +5 (+0.7%) |
Fitting 285/35R20 instead of 255/45R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
- 30 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 255/45R19
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