275/55R22 vs 285/50R22
Going from one to the other changes the overall height by -2.0 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 275/55R22 | 285/50R22 | Change |
|---|---|---|---|
| Overall height | 33.9" | 33.2" | -2.0 % |
| Sidewall | 5.95" | 5.61" | -5.8 % |
| Section width | 275 mm | 285 mm | +3.6 % |
| Circumference | 106.5" | 104.4" | -2.0 % |
| Revs per mile | 595 | 607 | +2.0 % |
| Axle height | 16.95" | 16.61" | -8.8 mm |
| Approved rim width | 7.5–10" | 8–10.5" | overlap 8–10" |
Both are approved on a rim 8" to 10" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 275/55R22. Fit 285/50R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.4 mph | -0.6 |
| 50 mph | 49.0 mph | -1.0 |
| 70 mph | 68.6 mph | -1.4 |
| 90 mph | 88.2 mph | -1.8 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,797 on the road, so it over-counts by 203. At a true 70 mph the first turns 694 times a minute, the second 708.
What drivers reported
275/55R22 carries 2 complaints. Nobody has filed one naming 285/50R22.