345/45R19 vs 335/45R19
Going from one to the other changes the overall height by -1.1 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 345/45R19 | 335/45R19 | Change |
|---|---|---|---|
| Overall height | 31.2" | 30.9" | -1.1 % |
| Sidewall | 6.11" | 5.94" | -2.9 % |
| Section width | 345 mm | 335 mm | -2.9 % |
| Circumference | 98.1" | 97.0" | -1.1 % |
| Revs per mile | 646 | 653 | +1.1 % |
| Axle height | 15.61" | 15.44" | -4.5 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 345/45R19. Fit 335/45R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.7 mph | -0.3 |
| 50 mph | 49.4 mph | -0.6 |
| 70 mph | 69.2 mph | -0.8 |
| 90 mph | 89.0 mph | -1.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,887 on the road, so it over-counts by 113. At a true 70 mph the first turns 754 times a minute, the second 762.