255/50R21 vs 275/45R22 tire size
275/45R22 vs 255/50R21, diameter
+2.3% taller
- Speedometer
- 58.7 mph
- At a true 60 mph
- Diameter
- 31.74 in
- Was 31.04 in
- Revs per mile
- 635
- Was 650
- 3% guideline
- Within
Car built for 255/50R21, now on 275/45R22.
255/50R21 and 275/45R22
| Measure | 255/50R21 | 275/45R22 | Difference |
|---|---|---|---|
| Width, mm | 255 | 275 | +20 |
| Sidewall, % of width | 50 | 45 | -5 |
| Rim, in | 21 | 22 | +1 |
| Section height, in | 5.02 | 4.87 | -0.15 |
| Diameter, in | 31.04 | 31.74 | +0.70 (+2.3%) |
| Circumference, in | 97.5 | 99.7 | +2.2 |
| Revs per mile | 650 | 635 | -14 (-2.2%) |
Fitting 275/45R22 instead of 255/50R21
Within the usual 3% diameter guideline.
- Needs 22 in wheels.
- 20 mm wider. Check rubbing at full lock.
Cars with 255/50R21
Cars with 275/45R22
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