185/80R13 vs 195/80R13
Going from one to the other changes the overall height by +2.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 185/80R13 | 195/80R13 | Change |
|---|---|---|---|
| Overall height | 24.7" | 25.3" | +2.6 % |
| Sidewall | 5.83" | 6.14" | +5.4 % |
| Section width | 185 mm | 195 mm | +5.4 % |
| Circumference | 77.5" | 79.4" | +2.6 % |
| Revs per mile | 818 | 798 | -2.6 % |
| Axle height | 12.33" | 12.64" | +8.0 mm |
| Approved rim width | 5–6.5" | 5.5–7" | overlap 5.5–6.5" |
Both are approved on a rim 5.5" to 6.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 185/80R13. Fit 195/80R13 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.3 mph | +1.3 |
| 70 mph | 71.8 mph | +1.8 |
| 90 mph | 92.3 mph | +2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,256 on the road, so it under-counts by 256. At a true 70 mph the first turns 954 times a minute, the second 931.
What drivers reported
185/80R13 carries 5 complaints. Nobody has filed one naming 195/80R13.