235/40R19 vs 265/30R20 tire size
265/30R20 vs 235/40R19, diameter
-0.5% shorter
- Speedometer
- 60.3 mph
- At a true 60 mph
- Diameter
- 26.26 in
- Was 26.40 in
- Revs per mile
- 768
- Was 764
- 3% guideline
- Within
Car built for 235/40R19, now on 265/30R20.
235/40R19 and 265/30R20
| Measure | 235/40R19 | 265/30R20 | Difference |
|---|---|---|---|
| Width, mm | 235 | 265 | +30 |
| Sidewall, % of width | 40 | 30 | -10 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 3.70 | 3.13 | -0.57 |
| Diameter, in | 26.40 | 26.26 | -0.14 (-0.5%) |
| Circumference, in | 82.9 | 82.5 | -0.4 |
| Revs per mile | 764 | 768 | +4 (+0.5%) |
Fitting 265/30R20 instead of 235/40R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
- 30 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 235/40R19
Cars with 265/30R20
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