245/50R19 vs 235/55R19
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 | 245/50R19 | 235/55R19 | Change |
|---|---|---|---|
| Overall height | 28.6" | 29.2" | +1.9 % |
| Sidewall | 4.82" | 5.09" | +5.5 % |
| Section width | 245 mm | 235 mm | -4.1 % |
| Circumference | 90.0" | 91.7" | +1.9 % |
| Revs per mile | 704 | 691 | -1.9 % |
| Axle height | 14.32" | 14.59" | +6.8 mm |
| Approved rim width | 7–9" | 6.5–8.5" | 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 245/50R19. Fit 235/55R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.6 mph | +0.6 |
| 50 mph | 50.9 mph | +0.9 |
| 70 mph | 71.3 mph | +1.3 |
| 90 mph | 91.7 mph | +1.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,186 on the road, so it under-counts by 186. At a true 70 mph the first turns 821 times a minute, the second 806.
What drivers reported
Nobody has filed a complaint naming 245/50R19. 235/55R19 carries 5.