315/35R20 vs 335/35R20
Going from one to the other changes the overall height by +1.9 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/35R20 | 335/35R20 | Change |
|---|---|---|---|
| Overall height | 28.7" | 29.2" | +1.9 % |
| Sidewall | 4.34" | 4.62" | +6.3 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 90.1" | 91.8" | +1.9 % |
| Revs per mile | 703 | 690 | -1.9 % |
| Axle height | 14.34" | 14.62" | +7.0 mm |
| Approved rim width | 8.5–11.5" | 9.5–12.5" | 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 315/35R20. Fit 335/35R20 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.6 mph | +0.6 |
| 50 mph | 51.0 mph | +1.0 |
| 70 mph | 71.3 mph | +1.3 |
| 90 mph | 91.7 mph | +1.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,192 on the road, so it under-counts by 192. At a true 70 mph the first turns 820 times a minute, the second 805.
What drivers reported
315/35R20 carries 2 complaints. Nobody has filed one naming 335/35R20.