325/65R20 vs 345/65R20
Going from one to the other changes the overall height by +2.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 325/65R20 | 345/65R20 | Change |
|---|---|---|---|
| Overall height | 36.6" | 37.7" | +2.8 % |
| Sidewall | 8.32" | 8.83" | +6.2 % |
| Section width | 325 mm | 345 mm | +6.2 % |
| Circumference | 115.1" | 118.3" | +2.8 % |
| Revs per mile | 551 | 536 | -2.8 % |
| Axle height | 18.32" | 18.83" | +13.0 mm |
| Approved rim width | 9–12" | 9.5–12.5" | overlap 9.5–12" |
Both are approved on a rim 9.5" to 12" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 325/65R20. Fit 345/65R20 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.4 mph | +1.4 |
| 70 mph | 72.0 mph | +2.0 |
| 90 mph | 92.5 mph | +2.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,279 on the road, so it under-counts by 279. At a true 70 mph the first turns 642 times a minute, the second 625.