275/45R21 vs 285/40R22 tire size
285/40R22 vs 275/45R21, diameter
+0.8% taller
- Speedometer
- 59.6 mph
- At a true 60 mph
- Diameter
- 30.98 in
- Was 30.74 in
- Revs per mile
- 651
- Was 656
- 3% guideline
- Within
Car built for 275/45R21, now on 285/40R22.
275/45R21 and 285/40R22
| Measure | 275/45R21 | 285/40R22 | Difference |
|---|---|---|---|
| Width, mm | 275 | 285 | +10 |
| Sidewall, % of width | 45 | 40 | -5 |
| Rim, in | 21 | 22 | +1 |
| Section height, in | 4.87 | 4.49 | -0.38 |
| Diameter, in | 30.74 | 30.98 | +0.23 (+0.8%) |
| Circumference, in | 96.6 | 97.3 | +0.7 |
| Revs per mile | 656 | 651 | -5 (-0.7%) |
Fitting 285/40R22 instead of 275/45R21
Within the usual 3% diameter guideline.
- Needs 22 in wheels.
Cars with 275/45R21
Cars with 285/40R22
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