255/45R21 vs 285/35R22 tire size
285/35R22 vs 255/45R21, diameter
-0.6% shorter
- Speedometer
- 60.4 mph
- At a true 60 mph
- Diameter
- 29.85 in
- Was 30.04 in
- Revs per mile
- 676
- Was 671
- 3% guideline
- Within
Car built for 255/45R21, now on 285/35R22.
255/45R21 and 285/35R22
| Measure | 255/45R21 | 285/35R22 | Difference |
|---|---|---|---|
| Width, mm | 255 | 285 | +30 |
| Sidewall, % of width | 45 | 35 | -10 |
| Rim, in | 21 | 22 | +1 |
| Section height, in | 4.52 | 3.93 | -0.59 |
| Diameter, in | 30.04 | 29.85 | -0.18 (-0.6%) |
| Circumference, in | 94.4 | 93.8 | -0.6 |
| Revs per mile | 671 | 676 | +4 (+0.6%) |
Fitting 285/35R22 instead of 255/45R21
Within the usual 3% diameter guideline.
- Needs 22 in wheels.
- 30 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 255/45R21
Cars with 285/35R22
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