265/80R24.5 vs 285/70R24.5
Going from one to the other changes the overall height by -2.4 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 265/80R24.5 | 285/70R24.5 | Change |
|---|---|---|---|
| Overall height | 41.2" | 40.2" | -2.4 % |
| Sidewall | 8.35" | 7.85" | -5.9 % |
| Section width | 265 mm | 285 mm | +7.5 % |
| Circumference | 129.4" | 126.3" | -2.4 % |
| Revs per mile | 490 | 502 | +2.4 % |
| Axle height | 20.60" | 20.10" | -12.5 mm |
| Approved rim width | 7.5–9.5" | 8–10.5" | 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 265/80R24.5. Fit 285/70R24.5 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.3 mph | -0.7 |
| 50 mph | 48.8 mph | -1.2 |
| 70 mph | 68.3 mph | -1.7 |
| 90 mph | 87.8 mph | -2.2 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,761 on the road, so it over-counts by 239. At a true 70 mph the first turns 571 times a minute, the second 585.