245/55R19 vs 275/45R20 tire size
275/45R20 vs 245/55R19, diameter
+0.5% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 29.74 in
- Was 29.61 in
- Revs per mile
- 678
- Was 681
- 3% guideline
- Within
Car built for 245/55R19, now on 275/45R20.
245/55R19 and 275/45R20
| Measure | 245/55R19 | 275/45R20 | Difference |
|---|---|---|---|
| Width, mm | 245 | 275 | +30 |
| Sidewall, % of width | 55 | 45 | -10 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 5.31 | 4.87 | -0.43 |
| Diameter, in | 29.61 | 29.74 | +0.13 (+0.5%) |
| Circumference, in | 93.0 | 93.4 | +0.4 |
| Revs per mile | 681 | 678 | -3 (-0.5%) |
Fitting 275/45R20 instead of 245/55R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
- 30 mm wider. Check rubbing at full lock.
Cars with 245/55R19
Cars with 275/45R20
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