255/40R23 vs 285/35R23 tire size
285/35R23 vs 255/40R23, diameter
-0.6% shorter
- Speedometer
- 60.3 mph
- At a true 60 mph
- Diameter
- 30.85 in
- Was 31.03 in
- Revs per mile
- 654
- Was 650
- 3% guideline
- Within
Car built for 255/40R23, now on 285/35R23.
255/40R23 and 285/35R23
| Measure | 255/40R23 | 285/35R23 | Difference |
|---|---|---|---|
| Width, mm | 255 | 285 | +30 |
| Sidewall, % of width | 40 | 35 | -5 |
| Rim, in | 23 | 23 | 0 |
| Section height, in | 4.02 | 3.93 | -0.09 |
| Diameter, in | 31.03 | 30.85 | -0.18 (-0.6%) |
| Circumference, in | 97.5 | 96.9 | -0.6 |
| Revs per mile | 650 | 654 | +4 (+0.6%) |
Fitting 285/35R23 instead of 255/40R23
Within the usual 3% diameter guideline.
- 30 mm wider. Check rubbing at full lock.
Cars with 255/40R23
Cars with 285/35R23
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