175/80R14 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 | 175/80R14 | 195/75R14 | Change |
|---|---|---|---|
| Overall height | 25.0" | 25.5" | +2.0 % |
| Sidewall | 5.51" | 5.76" | +4.5 % |
| Section width | 175 mm | 195 mm | +11.4 % |
| Circumference | 78.6" | 80.2" | +2.0 % |
| Revs per mile | 806 | 790 | -2.0 % |
| Axle height | 12.51" | 12.76" | +6.3 mm |
| Approved rim width | 5–6" | 5.5–7" | overlap 5.5–6" |
Both are approved on a rim 5.5" to 6" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 175/80R14. 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 10,197 on the road, so it under-counts by 197. At a true 70 mph the first turns 940 times a minute, the second 922.