265/60R24 vs 275/55R24
Going from one to the other changes the overall height by -1.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 265/60R24 | 275/55R24 | Change |
|---|---|---|---|
| Overall height | 36.5" | 35.9" | -1.7 % |
| Sidewall | 6.26" | 5.95" | -4.9 % |
| Section width | 265 mm | 275 mm | +3.8 % |
| Circumference | 114.7" | 112.8" | -1.7 % |
| Revs per mile | 552 | 562 | +1.7 % |
| Axle height | 18.26" | 17.95" | -7.8 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 265/60R24. Fit 275/55R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.2 mph | -0.8 |
| 70 mph | 68.8 mph | -1.2 |
| 90 mph | 88.5 mph | -1.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,833 on the road, so it over-counts by 167. At a true 70 mph the first turns 644 times a minute, the second 655.