205/55R18 vs 195/60R18
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 | 205/55R18 | 195/60R18 | Change |
|---|---|---|---|
| Overall height | 26.9" | 27.2" | +1.2 % |
| Sidewall | 4.44" | 4.61" | +3.8 % |
| Section width | 205 mm | 195 mm | -4.9 % |
| Circumference | 84.4" | 85.5" | +1.2 % |
| Revs per mile | 750 | 741 | -1.2 % |
| Axle height | 13.44" | 13.61" | +4.3 mm |
| Approved rim width | 5.5–7.5" | 5.5–7" | 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 205/55R18. Fit 195/60R18 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.4 mph | +0.4 |
| 50 mph | 50.6 mph | +0.6 |
| 70 mph | 70.9 mph | +0.9 |
| 90 mph | 91.1 mph | +1.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,125 on the road, so it under-counts by 125. At a true 70 mph the first turns 875 times a minute, the second 865.