215/65R14 vs 195/75R14
Going from one to the other changes the overall height by +2.0 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 215/65R14 | 195/75R14 | Change |
|---|---|---|---|
| Overall height | 25.0" | 25.5" | +2.0 % |
| Sidewall | 5.50" | 5.76" | +4.7 % |
| Section width | 215 mm | 195 mm | -9.3 % |
| Circumference | 78.6" | 80.2" | +2.0 % |
| Revs per mile | 807 | 790 | -2.0 % |
| Axle height | 12.50" | 12.76" | +6.5 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 215/65R14. Fit 195/75R14 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.6 mph | +0.6 |
| 50 mph | 51.0 mph | +1.0 |
| 70 mph | 71.4 mph | +1.4 |
| 90 mph | 91.8 mph | +1.8 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,205 on the road, so it under-counts by 205. At a true 70 mph the first turns 941 times a minute, the second 922.