355/65R24 vs 335/65R24
Going from one to the other changes the overall height by -2.4 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 355/65R24 | 335/65R24 | Change |
|---|---|---|---|
| Overall height | 42.2" | 41.1" | -2.4 % |
| Sidewall | 9.08" | 8.57" | -5.6 % |
| Section width | 355 mm | 335 mm | -5.6 % |
| Circumference | 132.5" | 129.3" | -2.4 % |
| Revs per mile | 478 | 490 | +2.4 % |
| Axle height | 21.08" | 20.57" | -13.0 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 355/65R24. Fit 335/65R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.3 mph | -0.7 |
| 50 mph | 48.8 mph | -1.2 |
| 70 mph | 68.3 mph | -1.7 |
| 90 mph | 87.8 mph | -2.2 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,757 on the road, so it over-counts by 243. At a true 70 mph the first turns 558 times a minute, the second 572.