255/40R18 vs 225/40R19 tire size
225/40R19 vs 255/40R18, diameter
+0.2% taller
- Speedometer
- 59.9 mph
- At a true 60 mph
- Diameter
- 26.09 in
- Was 26.03 in
- Revs per mile
- 773
- Was 775
- 3% guideline
- Within
Car built for 255/40R18, now on 225/40R19.
255/40R18 and 225/40R19
| Measure | 255/40R18 | 225/40R19 | Difference |
|---|---|---|---|
| Width, mm | 255 | 225 | -30 |
| Sidewall, % of width | 40 | 40 | 0 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 4.02 | 3.54 | -0.47 |
| Diameter, in | 26.03 | 26.09 | +0.06 (+0.2%) |
| Circumference, in | 81.8 | 82.0 | +0.2 |
| Revs per mile | 775 | 773 | -2 (-0.2%) |
Fitting 225/40R19 instead of 255/40R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
Cars with 255/40R18
Cars with 225/40R19
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