195/80R14 vs 175/85R14
Going from one to the other changes the overall height by -2.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 195/80R14 | 175/85R14 | Change |
|---|---|---|---|
| Overall height | 26.3" | 25.7" | -2.2 % |
| Sidewall | 6.14" | 5.86" | -4.6 % |
| Section width | 195 mm | 175 mm | -10.3 % |
| Circumference | 82.6" | 80.8" | -2.2 % |
| Revs per mile | 767 | 784 | +2.2 % |
| Axle height | 13.14" | 12.86" | -7.3 mm |
| Approved rim width | 5.5–7" | 5–6" | 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 195/80R14. Fit 175/85R14 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 | 68.5 mph | -1.5 |
| 90 mph | 88.0 mph | -2.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,783 on the road, so it over-counts by 217. At a true 70 mph the first turns 895 times a minute, the second 915.