335/40R24 vs 355/35R24
Going from one to the other changes the overall height by -2.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 335/40R24 | 355/35R24 | Change |
|---|---|---|---|
| Overall height | 34.6" | 33.8" | -2.2 % |
| Sidewall | 5.28" | 4.89" | -7.3 % |
| Section width | 335 mm | 355 mm | +6.0 % |
| Circumference | 108.5" | 106.1" | -2.2 % |
| Revs per mile | 584 | 597 | +2.2 % |
| Axle height | 17.28" | 16.89" | -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 335/40R24. Fit 355/35R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.3 mph | -0.7 |
| 50 mph | 48.9 mph | -1.1 |
| 70 mph | 68.4 mph | -1.6 |
| 90 mph | 88.0 mph | -2.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,778 on the road, so it over-counts by 222. At a true 70 mph the first turns 681 times a minute, the second 696.