235/45R19 vs 225/50R19
Going from one to the other changes the overall height by +1.9 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 235/45R19 | 225/50R19 | Change |
|---|---|---|---|
| Overall height | 27.3" | 27.9" | +1.9 % |
| Sidewall | 4.16" | 4.43" | +6.4 % |
| Section width | 235 mm | 225 mm | -4.3 % |
| Circumference | 85.8" | 87.5" | +1.9 % |
| Revs per mile | 738 | 724 | -1.9 % |
| Axle height | 13.66" | 13.93" | +6.8 mm |
| Approved rim width | 6.5–8.5" | 6–8.5" | overlap 6.5–8.5" |
Both are approved on a rim 6.5" to 8.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 235/45R19. Fit 225/50R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.6 mph | +0.6 |
| 50 mph | 51.0 mph | +1.0 |
| 70 mph | 71.4 mph | +1.4 |
| 90 mph | 91.8 mph | +1.8 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,194 on the road, so it under-counts by 194. At a true 70 mph the first turns 861 times a minute, the second 845.
What drivers reported
235/45R19 carries 8 complaints. Nobody has filed one naming 225/50R19.