315/30R19 vs 335/30R19
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 | 315/30R19 | 335/30R19 | Change |
|---|---|---|---|
| Overall height | 26.4" | 26.9" | +1.8 % |
| Sidewall | 3.72" | 3.96" | +6.3 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 83.1" | 84.6" | +1.8 % |
| Revs per mile | 763 | 749 | -1.8 % |
| Axle height | 13.22" | 13.46" | +6.0 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 315/30R19. Fit 335/30R19 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 10,179 on the road, so it under-counts by 179. At a true 70 mph the first turns 890 times a minute, the second 874.