295/70R17 vs 275/75R17
Going from one to the other changes the overall height by -0.1 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 295/70R17 | 275/75R17 | Change |
|---|---|---|---|
| Overall height | 33.3" | 33.2" | -0.1 % |
| Sidewall | 8.13" | 8.12" | -0.1 % |
| Section width | 295 mm | 275 mm | -6.8 % |
| Circumference | 104.5" | 104.4" | -0.1 % |
| Revs per mile | 606 | 607 | +0.1 % |
| Axle height | 16.63" | 16.62" | -0.3 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 295/70R17. Fit 275/75R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.0 mph | -0.0 |
| 50 mph | 50.0 mph | -0.0 |
| 70 mph | 70.0 mph | -0.0 |
| 90 mph | 89.9 mph | -0.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,994 on the road, so it over-counts by 6. At a true 70 mph the first turns 707 times a minute, the second 708.
What drivers reported
Nobody has filed a complaint naming 295/70R17. 275/75R17 carries 2.