335/45R21 vs 355/40R21
Going from one to the other changes the overall height by -2.1 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 335/45R21 | 355/40R21 | Change |
|---|---|---|---|
| Overall height | 32.9" | 32.2" | -2.1 % |
| Sidewall | 5.94" | 5.59" | -5.8 % |
| Section width | 335 mm | 355 mm | +6.0 % |
| Circumference | 103.3" | 101.1" | -2.1 % |
| Revs per mile | 614 | 627 | +2.1 % |
| Axle height | 16.44" | 16.09" | -8.8 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 335/45R21. Fit 355/40R21 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.4 mph | -0.6 |
| 50 mph | 49.0 mph | -1.0 |
| 70 mph | 68.5 mph | -1.5 |
| 90 mph | 88.1 mph | -1.9 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,790 on the road, so it over-counts by 210. At a true 70 mph the first turns 716 times a minute, the second 731.