335/40R19 vs 355/35R19
Going from one to the other changes the overall height by -2.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 335/40R19 | 355/35R19 | Change |
|---|---|---|---|
| Overall height | 29.6" | 28.8" | -2.6 % |
| Sidewall | 5.28" | 4.89" | -7.3 % |
| Section width | 335 mm | 355 mm | +6.0 % |
| Circumference | 92.8" | 90.4" | -2.6 % |
| Revs per mile | 682 | 701 | +2.6 % |
| Axle height | 14.78" | 14.39" | -9.8 mm |
| Approved rim width | 9.5–12.5" | 10–13" | overlap 10–12.5" |
Both are approved on a rim 10" to 12.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 335/40R19. Fit 355/35R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 |
| 50 mph | 48.7 mph | -1.3 |
| 70 mph | 68.2 mph | -1.8 |
| 90 mph | 87.7 mph | -2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,740 on the road, so it over-counts by 260. At a true 70 mph the first turns 796 times a minute, the second 817.