335/30R24 vs 355/30R24
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 | 335/30R24 | 355/30R24 | Change |
|---|---|---|---|
| Overall height | 31.9" | 32.4" | +1.5 % |
| Sidewall | 3.96" | 4.19" | +6.0 % |
| Section width | 335 mm | 355 mm | +6.0 % |
| Circumference | 100.3" | 101.7" | +1.5 % |
| Revs per mile | 632 | 623 | -1.5 % |
| Axle height | 15.96" | 16.19" | +6.0 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 335/30R24. Fit 355/30R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.4 mph | +0.4 |
| 50 mph | 50.7 mph | +0.7 |
| 70 mph | 71.0 mph | +1.0 |
| 90 mph | 91.3 mph | +1.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,148 on the road, so it under-counts by 148. At a true 70 mph the first turns 737 times a minute, the second 727.