245/55R18 vs 275/45R19 tire size
275/45R19 vs 245/55R18, diameter
+0.5% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 28.74 in
- Was 28.61 in
- Revs per mile
- 702
- Was 705
- 3% guideline
- Within
Car built for 245/55R18, now on 275/45R19.
245/55R18 and 275/45R19
| Measure | 245/55R18 | 275/45R19 | Difference |
|---|---|---|---|
| Width, mm | 245 | 275 | +30 |
| Sidewall, % of width | 55 | 45 | -10 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 5.31 | 4.87 | -0.43 |
| Diameter, in | 28.61 | 28.74 | +0.13 (+0.5%) |
| Circumference, in | 89.9 | 90.3 | +0.4 |
| Revs per mile | 705 | 702 | -3 (-0.5%) |
Fitting 275/45R19 instead of 245/55R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
- 30 mm wider. Check rubbing at full lock.
Cars with 245/55R18
Cars with 275/45R19
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