215/70R19 vs 195/75R19
Going from one to the other changes the overall height by -1.1 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 215/70R19 | 195/75R19 | Change |
|---|---|---|---|
| Overall height | 30.9" | 30.5" | -1.1 % |
| Sidewall | 5.93" | 5.76" | -2.8 % |
| Section width | 215 mm | 195 mm | -9.3 % |
| Circumference | 96.9" | 95.9" | -1.1 % |
| Revs per mile | 654 | 661 | +1.1 % |
| Axle height | 15.43" | 15.26" | -4.3 mm |
| Approved rim width | 6–8" | 5.5–7" | overlap 6–7" |
Both are approved on a rim 6" to 7" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 215/70R19. Fit 195/75R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.7 mph | -0.3 |
| 50 mph | 49.5 mph | -0.5 |
| 70 mph | 69.2 mph | -0.8 |
| 90 mph | 89.0 mph | -1.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,892 on the road, so it over-counts by 108. At a true 70 mph the first turns 763 times a minute, the second 771.