275/45R17 vs 295/45R17
Going from one to the other changes the overall height by +2.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 275/45R17 | 295/45R17 | Change |
|---|---|---|---|
| Overall height | 26.7" | 27.5" | +2.6 % |
| Sidewall | 4.87" | 5.23" | +7.3 % |
| Section width | 275 mm | 295 mm | +7.3 % |
| Circumference | 84.0" | 86.2" | +2.6 % |
| Revs per mile | 754 | 735 | -2.6 % |
| Axle height | 13.37" | 13.73" | +9.0 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 275/45R17. Fit 295/45R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.3 mph | +1.3 |
| 70 mph | 71.9 mph | +1.9 |
| 90 mph | 92.4 mph | +2.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,265 on the road, so it under-counts by 265. At a true 70 mph the first turns 880 times a minute, the second 857.