335/40R20 vs 315/40R20
Going from one to the other changes the overall height by -2.1 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 335/40R20 | 315/40R20 | Change |
|---|---|---|---|
| Overall height | 30.6" | 29.9" | -2.1 % |
| Sidewall | 5.28" | 4.96" | -6.0 % |
| Section width | 335 mm | 315 mm | -6.0 % |
| Circumference | 96.0" | 94.0" | -2.1 % |
| Revs per mile | 660 | 674 | +2.1 % |
| Axle height | 15.28" | 14.96" | -8.0 mm |
| Approved rim width | 9.5–12.5" | 8.5–11.5" | overlap 9.5–11.5" |
Both are approved on a rim 9.5" to 11.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 335/40R20. Fit 315/40R20 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.4 mph | -0.6 |
| 50 mph | 49.0 mph | -1.0 |
| 70 mph | 68.6 mph | -1.4 |
| 90 mph | 88.1 mph | -1.9 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,794 on the road, so it over-counts by 206. At a true 70 mph the first turns 770 times a minute, the second 786.