235/70R17 vs 235/65R18 tire size
235/65R18 vs 235/70R17, diameter
+0.2% taller
- Speedometer
- 59.9 mph
- At a true 60 mph
- Diameter
- 30.03 in
- Was 29.95 in
- Revs per mile
- 672
- Was 673
- 3% guideline
- Within
Car built for 235/70R17, now on 235/65R18.
235/70R17 and 235/65R18
| Measure | 235/70R17 | 235/65R18 | Difference |
|---|---|---|---|
| Width, mm | 235 | 235 | 0 |
| Sidewall, % of width | 70 | 65 | -5 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 6.48 | 6.01 | -0.46 |
| Diameter, in | 29.95 | 30.03 | +0.07 (+0.2%) |
| Circumference, in | 94.1 | 94.3 | +0.2 |
| Revs per mile | 673 | 672 | -2 (-0.2%) |
Fitting 235/65R18 instead of 235/70R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
Cars with 235/65R18
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