195/70R13 vs 175/80R13
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 | 195/70R13 | 175/80R13 | Change |
|---|---|---|---|
| Overall height | 23.7" | 24.0" | +1.2 % |
| Sidewall | 5.37" | 5.51" | +2.6 % |
| Section width | 195 mm | 175 mm | -10.3 % |
| Circumference | 74.6" | 75.5" | +1.2 % |
| Revs per mile | 849 | 840 | -1.2 % |
| Axle height | 11.87" | 12.01" | +3.5 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 195/70R13. Fit 175/80R13 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.3 mph | +0.3 |
| 50 mph | 50.6 mph | +0.6 |
| 70 mph | 70.8 mph | +0.8 |
| 90 mph | 91.0 mph | +1.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,116 on the road, so it under-counts by 116. At a true 70 mph the first turns 991 times a minute, the second 979.
What drivers reported
Nobody has filed a complaint naming 195/70R13. 175/80R13 carries 16.