235/80R17 vs 285/70R17 tire size
285/70R17 vs 235/80R17, diameter
+2.8% taller
- Speedometer
- 58.3 mph
- At a true 60 mph
- Diameter
- 32.71 in
- Was 31.80 in
- Revs per mile
- 617
- Was 634
- 3% guideline
- Within
Car built for 235/80R17, now on 285/70R17.
235/80R17 and 285/70R17
| Measure | 235/80R17 | 285/70R17 | Difference |
|---|---|---|---|
| Width, mm | 235 | 285 | +50 |
| Sidewall, % of width | 80 | 70 | -10 |
| Rim, in | 17 | 17 | 0 |
| Section height, in | 7.40 | 7.85 | +0.45 |
| Diameter, in | 31.80 | 32.71 | +0.91 (+2.8%) |
| Circumference, in | 99.9 | 102.8 | +2.8 |
| Revs per mile | 634 | 617 | -18 (-2.8%) |
Fitting 285/70R17 instead of 235/80R17
Within the usual 3% diameter guideline.
- 50 mm wider. Check rubbing at full lock.
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