315/50R19 vs 335/45R19
Going from one to the other changes the overall height by -1.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/50R19 | 335/45R19 | Change |
|---|---|---|---|
| Overall height | 31.4" | 30.9" | -1.7 % |
| Sidewall | 6.20" | 5.94" | -4.3 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 98.7" | 97.0" | -1.7 % |
| Revs per mile | 642 | 653 | +1.7 % |
| Axle height | 15.70" | 15.44" | -6.8 mm |
| Approved rim width | 8.5–11.5" | 9.5–12.5" | overlap 9.5–11.5" |
Both are approved on a rim 9.5" to 11.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 315/50R19. Fit 335/45R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.2 mph | -0.8 |
| 70 mph | 68.8 mph | -1.2 |
| 90 mph | 88.5 mph | -1.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,831 on the road, so it over-counts by 169. At a true 70 mph the first turns 749 times a minute, the second 762.