285/50R19 vs 265/50R19
Going from one to the other changes the overall height by -2.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 285/50R19 | 265/50R19 | Change |
|---|---|---|---|
| Overall height | 30.2" | 29.4" | -2.6 % |
| Sidewall | 5.61" | 5.22" | -7.0 % |
| Section width | 285 mm | 265 mm | -7.0 % |
| Circumference | 94.9" | 92.5" | -2.6 % |
| Revs per mile | 667 | 685 | +2.6 % |
| Axle height | 15.11" | 14.72" | -10.0 mm |
| Approved rim width | 8–10.5" | 7.5–9.5" | overlap 8–9.5" |
Both are approved on a rim 8" to 9.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 285/50R19. Fit 265/50R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 |
| 50 mph | 48.7 mph | -1.3 |
| 70 mph | 68.2 mph | -1.8 |
| 90 mph | 87.7 mph | -2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,739 on the road, so it over-counts by 261. At a true 70 mph the first turns 779 times a minute, the second 799.
What drivers reported
Nobody has filed a complaint naming 285/50R19. 265/50R19 carries 2.