255/75R17 vs 265/65R18 tire size
265/65R18 vs 255/75R17, diameter
-1.5% shorter
- Speedometer
- 60.9 mph
- At a true 60 mph
- Diameter
- 31.56 in
- Was 32.06 in
- Revs per mile
- 639
- Was 629
- 3% guideline
- Within
Car built for 255/75R17, now on 265/65R18.
255/75R17 and 265/65R18
| Measure | 255/75R17 | 265/65R18 | Difference |
|---|---|---|---|
| Width, mm | 255 | 265 | +10 |
| Sidewall, % of width | 75 | 65 | -10 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 7.53 | 6.78 | -0.75 |
| Diameter, in | 32.06 | 31.56 | -0.50 (-1.5%) |
| Circumference, in | 100.7 | 99.2 | -1.6 |
| Revs per mile | 629 | 639 | +10 (+1.6%) |
Fitting 265/65R18 instead of 255/75R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- Shorter sidewall: 0.7 in less.
Cars with 255/75R17
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