275/55R21 vs 285/45R22 tire size
285/45R22 vs 275/55R21, diameter
-2.5% shorter
- Speedometer
- 61.5 mph
- At a true 60 mph
- Diameter
- 32.10 in
- Was 32.91 in
- Revs per mile
- 628
- Was 613
- 3% guideline
- Within
Car built for 275/55R21, now on 285/45R22.
275/55R21 and 285/45R22
| Measure | 275/55R21 | 285/45R22 | Difference |
|---|---|---|---|
| Width, mm | 275 | 285 | +10 |
| Sidewall, % of width | 55 | 45 | -10 |
| Rim, in | 21 | 22 | +1 |
| Section height, in | 5.95 | 5.05 | -0.91 |
| Diameter, in | 32.91 | 32.10 | -0.81 (-2.5%) |
| Circumference, in | 103.4 | 100.8 | -2.5 |
| Revs per mile | 613 | 628 | +15 (+2.5%) |
Fitting 285/45R22 instead of 275/55R21
Within the usual 3% diameter guideline.
- Needs 22 in wheels.
- Shorter sidewall: 0.9 in less.
Cars with 275/55R21
Cars with 285/45R22
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