335/65R19 vs 345/60R19
Going from one to the other changes the overall height by -2.3 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 335/65R19 | 345/60R19 | Change |
|---|---|---|---|
| Overall height | 36.1" | 35.3" | -2.3 % |
| Sidewall | 8.57" | 8.15" | -4.9 % |
| Section width | 335 mm | 345 mm | +3.0 % |
| Circumference | 113.6" | 110.9" | -2.3 % |
| Revs per mile | 558 | 571 | +2.3 % |
| Axle height | 18.07" | 17.65" | -10.8 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 335/65R19. Fit 345/60R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.3 mph | -0.7 |
| 50 mph | 48.8 mph | -1.2 |
| 70 mph | 68.4 mph | -1.6 |
| 90 mph | 87.9 mph | -2.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,766 on the road, so it over-counts by 234. At a true 70 mph the first turns 651 times a minute, the second 667.