225/55R18 vs 245/45R19 tire size
245/45R19 vs 225/55R18, diameter
-0.2% shorter
- Speedometer
- 60.1 mph
- At a true 60 mph
- Diameter
- 27.68 in
- Was 27.74 in
- Revs per mile
- 729
- Was 727
- 3% guideline
- Within
Car built for 225/55R18, now on 245/45R19.
225/55R18 and 245/45R19
| Measure | 225/55R18 | 245/45R19 | Difference |
|---|---|---|---|
| Width, mm | 225 | 245 | +20 |
| Sidewall, % of width | 55 | 45 | -10 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 4.87 | 4.34 | -0.53 |
| Diameter, in | 27.74 | 27.68 | -0.06 (-0.2%) |
| Circumference, in | 87.2 | 87.0 | -0.2 |
| Revs per mile | 727 | 729 | +2 (+0.2%) |
Fitting 245/45R19 instead of 225/55R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
- 20 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.5 in less.
Cars with 225/55R18
Cars with 245/45R19
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