265/45R19 vs 265/40R20 tire size
265/40R20 vs 265/45R19, diameter
-0.2% shorter
- Speedometer
- 60.1 mph
- At a true 60 mph
- Diameter
- 28.35 in
- Was 28.39 in
- Revs per mile
- 711
- Was 710
- 3% guideline
- Within
Car built for 265/45R19, now on 265/40R20.
265/45R19 and 265/40R20
| Measure | 265/45R19 | 265/40R20 | Difference |
|---|---|---|---|
| Width, mm | 265 | 265 | 0 |
| Sidewall, % of width | 45 | 40 | -5 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 4.69 | 4.17 | -0.52 |
| Diameter, in | 28.39 | 28.35 | -0.04 (-0.2%) |
| Circumference, in | 89.2 | 89.1 | -0.1 |
| Revs per mile | 710 | 711 | +1 (+0.2%) |
Fitting 265/40R20 instead of 265/45R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
- Shorter sidewall: 0.5 in less.
Cars with 265/45R19
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