195/45R19 vs 195/40R19
Going from one to the other changes the overall height by -3.0 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 195/45R19 | 195/40R19 | Change |
|---|---|---|---|
| Overall height | 25.9" | 25.1" | -3.0 % |
| Sidewall | 3.45" | 3.07" | -11.1 % |
| Section width | 195 mm | 195 mm | 0.0 % |
| Circumference | 81.4" | 79.0" | -3.0 % |
| Revs per mile | 778 | 802 | +3.0 % |
| Axle height | 12.95" | 12.57" | -9.8 mm |
| Approved rim width | 5.5–7" | 5.5–7" | overlap 5.5–7" |
Both are approved on a rim 5.5" to 7" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 195/45R19. Fit 195/40R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.1 mph | -0.9 |
| 50 mph | 48.5 mph | -1.5 |
| 70 mph | 67.9 mph | -2.1 |
| 90 mph | 87.3 mph | -2.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,704 on the road, so it over-counts by 296. At a true 70 mph the first turns 908 times a minute, the second 936.