335/35R19 vs 355/30R19
Going from one to the other changes the overall height by -3.0 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 335/35R19 | 355/30R19 | Change |
|---|---|---|---|
| Overall height | 28.2" | 27.4" | -3.0 % |
| Sidewall | 4.62" | 4.19" | -9.2 % |
| Section width | 335 mm | 355 mm | +6.0 % |
| Circumference | 88.7" | 86.0" | -3.0 % |
| Revs per mile | 714 | 736 | +3.0 % |
| Axle height | 14.12" | 13.69" | -10.8 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 335/35R19. Fit 355/30R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.1 mph | -0.9 |
| 50 mph | 48.5 mph | -1.5 |
| 70 mph | 67.9 mph | -2.1 |
| 90 mph | 87.3 mph | -2.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,700 on the road, so it over-counts by 300. At a true 70 mph the first turns 833 times a minute, the second 859.