275/40R24 vs 295/40R24
Going from one to the other changes the overall height by +1.9 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 275/40R24 | 295/40R24 | Change |
|---|---|---|---|
| Overall height | 32.7" | 33.3" | +1.9 % |
| Sidewall | 4.33" | 4.65" | +7.3 % |
| Section width | 275 mm | 295 mm | +7.3 % |
| Circumference | 102.6" | 104.6" | +1.9 % |
| Revs per mile | 617 | 606 | -1.9 % |
| Axle height | 16.33" | 16.65" | +8.0 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 275/40R24. Fit 295/40R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.6 mph | +0.6 |
| 50 mph | 51.0 mph | +1.0 |
| 70 mph | 71.4 mph | +1.4 |
| 90 mph | 91.7 mph | +1.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,193 on the road, so it under-counts by 193. At a true 70 mph the first turns 720 times a minute, the second 707.