345/35R23 vs 335/35R23
Going from one to the other changes the overall height by -0.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 345/35R23 | 335/35R23 | Change |
|---|---|---|---|
| Overall height | 32.5" | 32.2" | -0.8 % |
| Sidewall | 4.75" | 4.62" | -2.9 % |
| Section width | 345 mm | 335 mm | -2.9 % |
| Circumference | 102.1" | 101.3" | -0.8 % |
| Revs per mile | 620 | 626 | +0.8 % |
| Axle height | 16.25" | 16.12" | -3.5 mm |
| Approved rim width | 9.5–12.5" | 9.5–12.5" | overlap 9.5–12.5" |
Both are approved on a rim 9.5" 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 345/35R23. Fit 335/35R23 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.7 mph | -0.3 |
| 50 mph | 49.6 mph | -0.4 |
| 70 mph | 69.4 mph | -0.6 |
| 90 mph | 89.2 mph | -0.8 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,915 on the road, so it over-counts by 85. At a true 70 mph the first turns 724 times a minute, the second 730.