235/80R17 vs 265/65R18 tire size
265/65R18 vs 235/80R17, diameter
-0.8% shorter
- Speedometer
- 60.5 mph
- At a true 60 mph
- Diameter
- 31.56 in
- Was 31.80 in
- Revs per mile
- 639
- Was 634
- 3% guideline
- Within
Car built for 235/80R17, now on 265/65R18.
235/80R17 and 265/65R18
| Measure | 235/80R17 | 265/65R18 | Difference |
|---|---|---|---|
| Width, mm | 235 | 265 | +30 |
| Sidewall, % of width | 80 | 65 | -15 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 7.40 | 6.78 | -0.62 |
| Diameter, in | 31.80 | 31.56 | -0.24 (-0.8%) |
| Circumference, in | 99.9 | 99.2 | -0.8 |
| Revs per mile | 634 | 639 | +5 (+0.8%) |
Fitting 265/65R18 instead of 235/80R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- 30 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 265/65R18
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