265/80R22.5 vs 275/75R22.5
Going from one to the other changes the overall height by -1.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 265/80R22.5 | 275/75R22.5 | Change |
|---|---|---|---|
| Overall height | 39.2" | 38.7" | -1.2 % |
| Sidewall | 8.35" | 8.12" | -2.7 % |
| Section width | 265 mm | 275 mm | +3.8 % |
| Circumference | 123.1" | 121.7" | -1.2 % |
| Revs per mile | 515 | 521 | +1.2 % |
| Axle height | 19.60" | 19.37" | -5.8 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 265/80R22.5. Fit 275/75R22.5 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.7 mph | -0.3 |
| 50 mph | 49.4 mph | -0.6 |
| 70 mph | 69.2 mph | -0.8 |
| 90 mph | 89.0 mph | -1.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,884 on the road, so it over-counts by 116. At a true 70 mph the first turns 600 times a minute, the second 607.