285/45R19 vs 275/50R19
Going from one to the other changes the overall height by +2.5 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 285/45R19 | 275/50R19 | Change |
|---|---|---|---|
| Overall height | 29.1" | 29.8" | +2.5 % |
| Sidewall | 5.05" | 5.41" | +7.2 % |
| Section width | 285 mm | 275 mm | -3.5 % |
| Circumference | 91.4" | 93.7" | +2.5 % |
| Revs per mile | 693 | 676 | -2.5 % |
| Axle height | 14.55" | 14.91" | +9.3 mm |
| Approved rim width | 8–10.5" | 7.5–10" | 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 285/45R19. Fit 275/50R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.3 mph | +1.3 |
| 70 mph | 71.8 mph | +1.8 |
| 90 mph | 92.3 mph | +2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,250 on the road, so it under-counts by 250. At a true 70 mph the first turns 809 times a minute, the second 789.
What drivers reported
285/45R19 carries 2 complaints. Nobody has filed one naming 275/50R19.