195/65R17 vs 175/70R17
Going from one to the other changes the overall height by -1.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 195/65R17 | 175/70R17 | Change |
|---|---|---|---|
| Overall height | 27.0" | 26.6" | -1.2 % |
| Sidewall | 4.99" | 4.82" | -3.4 % |
| Section width | 195 mm | 175 mm | -10.3 % |
| Circumference | 84.8" | 83.7" | -1.2 % |
| Revs per mile | 748 | 757 | +1.2 % |
| Axle height | 13.49" | 13.32" | -4.3 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 195/65R17. Fit 175/70R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.6 mph | -0.4 |
| 50 mph | 49.4 mph | -0.6 |
| 70 mph | 69.1 mph | -0.9 |
| 90 mph | 88.9 mph | -1.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,876 on the road, so it over-counts by 124. At a true 70 mph the first turns 872 times a minute, the second 883.
What drivers reported
195/65R17 carries 2 complaints. Nobody has filed one naming 175/70R17.