295/40R24 vs 275/40R24
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 | 295/40R24 | 275/40R24 | Change |
|---|---|---|---|
| Overall height | 33.3" | 32.7" | -1.9 % |
| Sidewall | 4.65" | 4.33" | -6.8 % |
| Section width | 295 mm | 275 mm | -6.8 % |
| Circumference | 104.6" | 102.6" | -1.9 % |
| Revs per mile | 606 | 617 | +1.9 % |
| Axle height | 16.65" | 16.33" | -8.0 mm |
| Approved rim width | 8.5–11" | 7.5–10" | 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 295/40R24. Fit 275/40R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.4 mph | -0.6 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.7 mph | -1.3 |
| 90 mph | 88.3 mph | -1.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,811 on the road, so it over-counts by 189. At a true 70 mph the first turns 707 times a minute, the second 720.