355/35R20 vs 335/40R20
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 | 355/35R20 | 335/40R20 | Change |
|---|---|---|---|
| Overall height | 29.8" | 30.6" | +2.6 % |
| Sidewall | 4.89" | 5.28" | +7.8 % |
| Section width | 355 mm | 335 mm | -5.6 % |
| Circumference | 93.6" | 96.0" | +2.6 % |
| Revs per mile | 677 | 660 | -2.6 % |
| Axle height | 14.89" | 15.28" | +9.8 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 355/35R20. Fit 335/40R20 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.3 mph | +1.3 |
| 70 mph | 71.8 mph | +1.8 |
| 90 mph | 92.3 mph | +2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,258 on the road, so it under-counts by 258. At a true 70 mph the first turns 790 times a minute, the second 770.