265/70R19 vs 275/70R19
Going from one to the other changes the overall height by +1.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 265/70R19 | 275/70R19 | Change |
|---|---|---|---|
| Overall height | 33.6" | 34.2" | +1.6 % |
| Sidewall | 7.30" | 7.58" | +3.8 % |
| Section width | 265 mm | 275 mm | +3.8 % |
| Circumference | 105.6" | 107.3" | +1.6 % |
| Revs per mile | 600 | 590 | -1.6 % |
| Axle height | 16.80" | 17.08" | +7.0 mm |
| Approved rim width | 7.5–9.5" | 7.5–10" | overlap 7.5–9.5" |
Both are approved on a rim 7.5" 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 265/70R19. Fit 275/70R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.5 mph | +0.5 |
| 50 mph | 50.8 mph | +0.8 |
| 70 mph | 71.1 mph | +1.1 |
| 90 mph | 91.5 mph | +1.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,164 on the road, so it under-counts by 164. At a true 70 mph the first turns 700 times a minute, the second 689.