355/25R19 vs 335/25R19
Going from one to the other changes the overall height by -1.5 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 355/25R19 | 335/25R19 | Change |
|---|---|---|---|
| Overall height | 26.0" | 25.6" | -1.5 % |
| Sidewall | 3.49" | 3.30" | -5.6 % |
| Section width | 355 mm | 335 mm | -5.6 % |
| Circumference | 81.6" | 80.4" | -1.5 % |
| Revs per mile | 776 | 788 | +1.5 % |
| Axle height | 12.99" | 12.80" | -5.0 mm |
| Approved rim width | 10–13" | 9.5–12.5" | 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 355/25R19. Fit 335/25R19 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 | 68.9 mph | -1.1 |
| 90 mph | 88.6 mph | -1.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,849 on the road, so it over-counts by 151. At a true 70 mph the first turns 905 times a minute, the second 919.