205/60R19 vs 225/50R19
Going from one to the other changes the overall height by -2.9 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 205/60R19 | 225/50R19 | Change |
|---|---|---|---|
| Overall height | 28.7" | 27.9" | -2.9 % |
| Sidewall | 4.84" | 4.43" | -8.5 % |
| Section width | 205 mm | 225 mm | +9.8 % |
| Circumference | 90.1" | 87.5" | -2.9 % |
| Revs per mile | 703 | 724 | +2.9 % |
| Axle height | 14.34" | 13.93" | -10.5 mm |
| Approved rim width | 5.5–7.5" | 6–8.5" | 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 205/60R19. Fit 225/50R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.1 mph | -0.9 |
| 50 mph | 48.6 mph | -1.4 |
| 70 mph | 68.0 mph | -2.0 |
| 90 mph | 87.4 mph | -2.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,712 on the road, so it over-counts by 288. At a true 70 mph the first turns 820 times a minute, the second 845.