345/65R20 vs 355/60R20
Going from one to the other changes the overall height by -2.4 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 345/65R20 | 355/60R20 | Change |
|---|---|---|---|
| Overall height | 37.7" | 36.8" | -2.4 % |
| Sidewall | 8.83" | 8.39" | -5.0 % |
| Section width | 345 mm | 355 mm | +2.9 % |
| Circumference | 118.3" | 115.5" | -2.4 % |
| Revs per mile | 536 | 548 | +2.4 % |
| Axle height | 18.83" | 18.39" | -11.3 mm |
| Approved rim width | 9.5–12.5" | 10–13" | overlap 10–12.5" |
Both are approved on a rim 10" 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 345/65R20. Fit 355/60R20 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 9,765 on the road, so it over-counts by 235. At a true 70 mph the first turns 625 times a minute, the second 640.