225/55R18 vs 155/70R19 tire size
155/70R19 vs 225/55R18, diameter
-0.7% shorter
- Speedometer
- 60.4 mph
- At a true 60 mph
- Diameter
- 27.54 in
- Was 27.74 in
- Revs per mile
- 732
- Was 727
- 3% guideline
- Within
Car built for 225/55R18, now on 155/70R19.
225/55R18 and 155/70R19
| Measure | 225/55R18 | 155/70R19 | Difference |
|---|---|---|---|
| Width, mm | 225 | 155 | -70 |
| Sidewall, % of width | 55 | 70 | +15 |
| Rim, in | 18 | 19 | +1 |
| Section height, in | 4.87 | 4.27 | -0.60 |
| Diameter, in | 27.74 | 27.54 | -0.20 (-0.7%) |
| Circumference, in | 87.2 | 86.5 | -0.6 |
| Revs per mile | 727 | 732 | +5 (+0.7%) |
Fitting 155/70R19 instead of 225/55R18
Within the usual 3% diameter guideline.
- Needs 19 in wheels.
- Shorter sidewall: 0.6 in less.
Cars with 225/55R18
Cars with 155/70R19
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