195/75R17 vs 205/70R17
Going from one to the other changes the overall height by -0.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 195/75R17 | 205/70R17 | Change |
|---|---|---|---|
| Overall height | 28.5" | 28.3" | -0.8 % |
| Sidewall | 5.76" | 5.65" | -1.9 % |
| Section width | 195 mm | 205 mm | +5.1 % |
| Circumference | 89.6" | 88.9" | -0.8 % |
| Revs per mile | 707 | 713 | +0.8 % |
| Axle height | 14.26" | 14.15" | -2.8 mm |
| Approved rim width | 5.5–7" | 5.5–7.5" | 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 195/75R17. Fit 205/70R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.8 mph | -0.2 |
| 50 mph | 49.6 mph | -0.4 |
| 70 mph | 69.5 mph | -0.5 |
| 90 mph | 89.3 mph | -0.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,924 on the road, so it over-counts by 76. At a true 70 mph the first turns 825 times a minute, the second 831.
What drivers reported
Nobody has filed a complaint naming 195/75R17. 205/70R17 carries 1.