345/25R20 vs 335/25R20
Going from one to the other changes the overall height by -0.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 345/25R20 | 335/25R20 | Change |
|---|---|---|---|
| Overall height | 26.8" | 26.6" | -0.7 % |
| Sidewall | 3.40" | 3.30" | -2.9 % |
| Section width | 345 mm | 335 mm | -2.9 % |
| Circumference | 84.2" | 83.5" | -0.7 % |
| Revs per mile | 753 | 758 | +0.7 % |
| Axle height | 13.40" | 13.30" | -2.5 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 345/25R20. Fit 335/25R20 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.8 mph | -0.2 |
| 50 mph | 49.6 mph | -0.4 |
| 70 mph | 69.5 mph | -0.5 |
| 90 mph | 89.3 mph | -0.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,927 on the road, so it over-counts by 73. At a true 70 mph the first turns 878 times a minute, the second 885.