245/50R18 vs 275/40R19 tire size
275/40R19 vs 245/50R18, diameter
Same diameter
- Speedometer
- 60.0 mph
- At a true 60 mph
- Diameter
- 27.66 in
- Was 27.65 in
- Revs per mile
- 729
- Was 730
- 3% guideline
- Within
Car built for 245/50R18, now on 275/40R19.
245/50R18 and 275/40R19
| Measure | 245/50R18 | 275/40R19 | Difference |
|---|---|---|---|
| Width, mm | 245 | 275 | +30 |
| Sidewall, % of width | 50 | 40 | -10 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 4.82 | 4.33 | -0.49 |
| Diameter, in | 27.65 | 27.66 | +0.02 (+0.1%) |
| Circumference, in | 86.9 | 86.9 | +0.0 |
| Revs per mile | 730 | 729 | -0 (-0.1%) |
Fitting 275/40R19 instead of 245/50R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
- 30 mm wider. Check rubbing at full lock.
Cars with 245/50R18
Cars with 275/40R19
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