245/50R24 vs 265/50R24
Going from one to the other changes the overall height by +2.3 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 245/50R24 | 265/50R24 | Change |
|---|---|---|---|
| Overall height | 33.6" | 34.4" | +2.3 % |
| Sidewall | 4.82" | 5.22" | +8.2 % |
| Section width | 245 mm | 265 mm | +8.2 % |
| Circumference | 105.7" | 108.2" | +2.3 % |
| Revs per mile | 599 | 586 | -2.3 % |
| Axle height | 16.82" | 17.22" | +10.0 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 245/50R24. Fit 265/50R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.7 mph | +0.7 |
| 50 mph | 51.2 mph | +1.2 |
| 70 mph | 71.6 mph | +1.6 |
| 90 mph | 92.1 mph | +2.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,234 on the road, so it under-counts by 234. At a true 70 mph the first turns 699 times a minute, the second 683.