205/75R14 vs 195/75R14
Going from one to the other changes the overall height by -2.3 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 205/75R14 | 195/75R14 | Change |
|---|---|---|---|
| Overall height | 26.1" | 25.5" | -2.3 % |
| Sidewall | 6.05" | 5.76" | -4.9 % |
| Section width | 205 mm | 195 mm | -4.9 % |
| Circumference | 82.0" | 80.2" | -2.3 % |
| Revs per mile | 773 | 790 | +2.3 % |
| Axle height | 13.05" | 12.76" | -7.5 mm |
| Approved rim width | 5.5–7.5" | 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 205/75R14. Fit 195/75R14 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.3 mph | -0.7 |
| 50 mph | 48.9 mph | -1.1 |
| 70 mph | 68.4 mph | -1.6 |
| 90 mph | 88.0 mph | -2.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,774 on the road, so it over-counts by 226. At a true 70 mph the first turns 901 times a minute, the second 922.