225/45R19 vs 205/50R19
Going from one to the other changes the overall height by +0.4 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 225/45R19 | 205/50R19 | Change |
|---|---|---|---|
| Overall height | 27.0" | 27.1" | +0.4 % |
| Sidewall | 3.99" | 4.04" | +1.2 % |
| Section width | 225 mm | 205 mm | -8.9 % |
| Circumference | 84.7" | 85.0" | +0.4 % |
| Revs per mile | 748 | 745 | -0.4 % |
| Axle height | 13.49" | 13.54" | +1.3 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 225/45R19. Fit 205/50R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.1 mph | +0.1 |
| 50 mph | 50.2 mph | +0.2 |
| 70 mph | 70.3 mph | +0.3 |
| 90 mph | 90.3 mph | +0.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,036 on the road, so it under-counts by 36. At a true 70 mph the first turns 872 times a minute, the second 869.
What drivers reported
225/45R19 carries 1 complaints. Nobody has filed one naming 205/50R19.