245/55R18 vs 235/50R19 tire size
235/50R19 vs 245/55R18, diameter
-1.3% shorter
- Speedometer
- 60.8 mph
- At a true 60 mph
- Diameter
- 28.25 in
- Was 28.61 in
- Revs per mile
- 714
- Was 705
- 3% guideline
- Within
Car built for 245/55R18, now on 235/50R19.
245/55R18 and 235/50R19
| Measure | 245/55R18 | 235/50R19 | Difference |
|---|---|---|---|
| Width, mm | 245 | 235 | -10 |
| Sidewall, % of width | 55 | 50 | -5 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 5.31 | 4.63 | -0.68 |
| Diameter, in | 28.61 | 28.25 | -0.36 (-1.3%) |
| Circumference, in | 89.9 | 88.8 | -1.1 |
| Revs per mile | 705 | 714 | +9 (+1.3%) |
Fitting 235/50R19 instead of 245/55R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
- Shorter sidewall: 0.7 in less.
Cars with 245/55R18
Cars with 235/50R19
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