245/45R19 vs 265/45R19
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 | 245/45R19 | 265/45R19 | Change |
|---|---|---|---|
| Overall height | 27.7" | 28.4" | +2.6 % |
| Sidewall | 4.34" | 4.69" | +8.2 % |
| Section width | 245 mm | 265 mm | +8.2 % |
| Circumference | 87.0" | 89.2" | +2.6 % |
| Revs per mile | 729 | 710 | -2.6 % |
| Axle height | 13.84" | 14.19" | +9.0 mm |
| Approved rim width | 7–9" | 7.5–9.5" | overlap 7.5–9" |
Both are approved on a rim 7.5" to 9" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 245/45R19. Fit 265/45R19 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 10,256 on the road, so it under-counts by 256. At a true 70 mph the first turns 850 times a minute, the second 829.
What drivers reported
245/45R19 carries 6 complaints. Nobody has filed one naming 265/45R19.