215/55R19 vs 195/65R19
Going from one to the other changes the overall height by +2.4 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 215/55R19 | 195/65R19 | Change |
|---|---|---|---|
| Overall height | 28.3" | 29.0" | +2.4 % |
| Sidewall | 4.66" | 4.99" | +7.2 % |
| Section width | 215 mm | 195 mm | -9.3 % |
| Circumference | 88.9" | 91.0" | +2.4 % |
| Revs per mile | 712 | 696 | -2.4 % |
| Axle height | 14.16" | 14.49" | +8.5 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 215/55R19. Fit 195/65R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.7 mph | +0.7 |
| 50 mph | 51.2 mph | +1.2 |
| 70 mph | 71.7 mph | +1.7 |
| 90 mph | 92.1 mph | +2.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,236 on the road, so it under-counts by 236. At a true 70 mph the first turns 831 times a minute, the second 812.