255/75R17 vs 285/70R17 tire size
285/70R17 vs 255/75R17, diameter
+2.0% taller
- Speedometer
- 58.8 mph
- At a true 60 mph
- Diameter
- 32.71 in
- Was 32.06 in
- Revs per mile
- 617
- Was 629
- 3% guideline
- Within
Car built for 255/75R17, now on 285/70R17.
255/75R17 and 285/70R17
| Measure | 255/75R17 | 285/70R17 | Difference |
|---|---|---|---|
| Width, mm | 255 | 285 | +30 |
| Sidewall, % of width | 75 | 70 | -5 |
| Rim, in | 17 | 17 | 0 |
| Section height, in | 7.53 | 7.85 | +0.32 |
| Diameter, in | 32.06 | 32.71 | +0.65 (+2.0%) |
| Circumference, in | 100.7 | 102.8 | +2.0 |
| Revs per mile | 629 | 617 | -12 (-2.0%) |
Fitting 285/70R17 instead of 255/75R17
Within the usual 3% diameter guideline.
- 30 mm wider. Check rubbing at full lock.
Cars with 255/75R17
Cars with 285/70R17
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