205/80R17 vs 195/80R17
Going from one to the other changes the overall height by -2.1 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 205/80R17 | 195/80R17 | Change |
|---|---|---|---|
| Overall height | 29.9" | 29.3" | -2.1 % |
| Sidewall | 6.46" | 6.14" | -4.9 % |
| Section width | 205 mm | 195 mm | -4.9 % |
| Circumference | 94.0" | 92.0" | -2.1 % |
| Revs per mile | 674 | 689 | +2.1 % |
| Axle height | 14.96" | 14.64" | -8.0 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 205/80R17. Fit 195/80R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.4 mph | -0.6 |
| 50 mph | 48.9 mph | -1.1 |
| 70 mph | 68.5 mph | -1.5 |
| 90 mph | 88.1 mph | -1.9 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,789 on the road, so it over-counts by 211. At a true 70 mph the first turns 787 times a minute, the second 804.