195/70R14 vs 205/70R14
Going from one to the other changes the overall height by +2.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 195/70R14 | 205/70R14 | Change |
|---|---|---|---|
| Overall height | 24.7" | 25.3" | +2.2 % |
| Sidewall | 5.37" | 5.65" | +5.1 % |
| Section width | 195 mm | 205 mm | +5.1 % |
| Circumference | 77.7" | 79.5" | +2.2 % |
| Revs per mile | 815 | 797 | -2.2 % |
| Axle height | 12.37" | 12.65" | +7.0 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 195/70R14. Fit 205/70R14 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.7 mph | +0.7 |
| 50 mph | 51.1 mph | +1.1 |
| 70 mph | 71.6 mph | +1.6 |
| 90 mph | 92.0 mph | +2.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,223 on the road, so it under-counts by 223. At a true 70 mph the first turns 951 times a minute, the second 930.