355/50R23 vs 335/50R23
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 | 355/50R23 | 335/50R23 | Change |
|---|---|---|---|
| Overall height | 37.0" | 36.2" | -2.1 % |
| Sidewall | 6.99" | 6.59" | -5.6 % |
| Section width | 355 mm | 335 mm | -5.6 % |
| Circumference | 116.2" | 113.7" | -2.1 % |
| Revs per mile | 545 | 557 | +2.1 % |
| Axle height | 18.49" | 18.09" | -10.0 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 355/50R23. Fit 335/50R23 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.4 mph | -0.6 |
| 50 mph | 48.9 mph | -1.1 |
| 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 9,787 on the road, so it over-counts by 213. At a true 70 mph the first turns 636 times a minute, the second 650.