235/45R20 vs 265/40R20 tire size
265/40R20 vs 235/45R20, diameter
Same diameter
- Speedometer
- 60.0 mph
- At a true 60 mph
- Diameter
- 28.35 in
- Was 28.33 in
- Revs per mile
- 711
- Was 712
- 3% guideline
- Within
Car built for 235/45R20, now on 265/40R20.
235/45R20 and 265/40R20
| Measure | 235/45R20 | 265/40R20 | Difference |
|---|---|---|---|
| Width, mm | 235 | 265 | +30 |
| Sidewall, % of width | 45 | 40 | -5 |
| Rim, in | 20 | 20 | 0 |
| Section height, in | 4.16 | 4.17 | +0.01 |
| Diameter, in | 28.33 | 28.35 | +0.02 (+0.1%) |
| Circumference, in | 89.0 | 89.1 | +0.1 |
| Revs per mile | 712 | 711 | -0 (-0.1%) |
Fitting 265/40R20 instead of 235/45R20
Within the usual 3% diameter guideline.
- 30 mm wider. Check rubbing at full lock.
Cars with 235/45R20
Cars with 265/40R20
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