315/55R19 vs 295/55R19
Going from one to the other changes the overall height by -2.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/55R19 | 295/55R19 | Change |
|---|---|---|---|
| Overall height | 32.6" | 31.8" | -2.7 % |
| Sidewall | 6.82" | 6.39" | -6.3 % |
| Section width | 315 mm | 295 mm | -6.3 % |
| Circumference | 102.5" | 99.8" | -2.7 % |
| Revs per mile | 618 | 635 | +2.7 % |
| Axle height | 16.32" | 15.89" | -11.0 mm |
| Approved rim width | 8.5–11.5" | 8.5–11" | overlap 8.5–11" |
Both are approved on a rim 8.5" to 11" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 315/55R19. Fit 295/55R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 |
| 50 mph | 48.7 mph | -1.3 |
| 70 mph | 68.1 mph | -1.9 |
| 90 mph | 87.6 mph | -2.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,735 on the road, so it over-counts by 265. At a true 70 mph the first turns 721 times a minute, the second 740.