285/75R17 vs 315/70R17 tire size
315/70R17 vs 285/75R17, diameter
+1.6% taller
- Speedometer
- 59.1 mph
- At a true 60 mph
- Diameter
- 34.36 in
- Was 33.83 in
- Revs per mile
- 587
- Was 596
- 3% guideline
- Within
Car built for 285/75R17, now on 315/70R17.
285/75R17 and 315/70R17
| Measure | 285/75R17 | 315/70R17 | Difference |
|---|---|---|---|
| Width, mm | 285 | 315 | +30 |
| Sidewall, % of width | 75 | 70 | -5 |
| Rim, in | 17 | 17 | 0 |
| Section height, in | 8.42 | 8.68 | +0.27 |
| Diameter, in | 33.83 | 34.36 | +0.53 (+1.6%) |
| Circumference, in | 106.3 | 108.0 | +1.7 |
| Revs per mile | 596 | 587 | -9 (-1.5%) |
Fitting 315/70R17 instead of 285/75R17
Within the usual 3% diameter guideline.
- 30 mm wider. Check rubbing at full lock.
Cars with 285/75R17
Cars with 315/70R17
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