235/55R19 vs 245/50R19
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 | 235/55R19 | 245/50R19 | Change |
|---|---|---|---|
| Overall height | 29.2" | 28.6" | -1.8 % |
| Sidewall | 5.09" | 4.82" | -5.2 % |
| Section width | 235 mm | 245 mm | +4.3 % |
| Circumference | 91.7" | 90.0" | -1.8 % |
| Revs per mile | 691 | 704 | +1.8 % |
| Axle height | 14.59" | 14.32" | -6.8 mm |
| Approved rim width | 6.5–8.5" | 7–9" | overlap 7–8.5" |
Both are approved on a rim 7" 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 235/55R19. Fit 245/50R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.7 mph | -1.3 |
| 90 mph | 88.4 mph | -1.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,818 on the road, so it over-counts by 182. At a true 70 mph the first turns 806 times a minute, the second 821.
What drivers reported
235/55R19 carries 5 complaints. Nobody has filed one naming 245/50R19.