225/45R19 vs 215/50R19
Going from one to the other changes the overall height by +1.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 225/45R19 | 215/50R19 | Change |
|---|---|---|---|
| Overall height | 27.0" | 27.5" | +1.8 % |
| Sidewall | 3.99" | 4.23" | +6.2 % |
| Section width | 225 mm | 215 mm | -4.4 % |
| Circumference | 84.7" | 86.3" | +1.8 % |
| Revs per mile | 748 | 734 | -1.8 % |
| Axle height | 13.49" | 13.73" | +6.3 mm |
| Approved rim width | 6–8.5" | 6–8" | overlap 6–8" |
Both are approved on a rim 6" to 8" 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 215/50R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.5 mph | +0.5 |
| 50 mph | 50.9 mph | +0.9 |
| 70 mph | 71.3 mph | +1.3 |
| 90 mph | 91.6 mph | +1.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,182 on the road, so it under-counts by 182. At a true 70 mph the first turns 872 times a minute, the second 857.
What drivers reported
225/45R19 carries 1 complaints. Nobody has filed one naming 215/50R19.