285/65R18 vs 255/65R19 tire size
255/65R19 vs 285/65R18, diameter
-1.6% shorter
- Speedometer
- 61.0 mph
- At a true 60 mph
- Diameter
- 32.05 in
- Was 32.59 in
- Revs per mile
- 629
- Was 619
- 3% guideline
- Within
Car built for 285/65R18, now on 255/65R19.
285/65R18 and 255/65R19
| Measure | 285/65R18 | 255/65R19 | Difference |
|---|---|---|---|
| Width, mm | 285 | 255 | -30 |
| Sidewall, % of width | 65 | 65 | 0 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 7.29 | 6.53 | -0.77 |
| Diameter, in | 32.59 | 32.05 | -0.54 (-1.6%) |
| Circumference, in | 102.4 | 100.7 | -1.7 |
| Revs per mile | 619 | 629 | +10 (+1.7%) |
Fitting 255/65R19 instead of 285/65R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
- Shorter sidewall: 0.8 in less.
Cars with 285/65R18
Cars with 255/65R19
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