275/55R24 vs 295/55R24
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 | 275/55R24 | 295/55R24 | Change |
|---|---|---|---|
| Overall height | 35.9" | 36.8" | +2.4 % |
| Sidewall | 5.95" | 6.39" | +7.3 % |
| Section width | 275 mm | 295 mm | +7.3 % |
| Circumference | 112.8" | 115.5" | +2.4 % |
| Revs per mile | 562 | 548 | -2.4 % |
| Axle height | 17.95" | 18.39" | +11.0 mm |
| Approved rim width | 7.5–10" | 8.5–11" | overlap 8.5–10" |
Both are approved on a rim 8.5" to 10" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 275/55R24. Fit 295/55R24 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 | 71.7 mph | +1.7 |
| 90 mph | 92.2 mph | +2.2 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,241 on the road, so it under-counts by 241. At a true 70 mph the first turns 655 times a minute, the second 640.