225/50R19 vs 205/50R19
Going from one to the other changes the overall height by -2.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 225/50R19 | 205/50R19 | Change |
|---|---|---|---|
| Overall height | 27.9" | 27.1" | -2.8 % |
| Sidewall | 4.43" | 4.04" | -8.9 % |
| Section width | 225 mm | 205 mm | -8.9 % |
| Circumference | 87.5" | 85.0" | -2.8 % |
| Revs per mile | 724 | 745 | +2.8 % |
| Axle height | 13.93" | 13.54" | -10.0 mm |
| Approved rim width | 6–8.5" | 5.5–7.5" | overlap 6–7.5" |
Both are approved on a rim 6" to 7.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 225/50R19. Fit 205/50R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 |
| 50 mph | 48.6 mph | -1.4 |
| 70 mph | 68.0 mph | -2.0 |
| 90 mph | 87.5 mph | -2.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,717 on the road, so it over-counts by 283. At a true 70 mph the first turns 845 times a minute, the second 869.