315/40R17 vs 335/35R17
Going from one to the other changes the overall height by -2.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/40R17 | 335/35R17 | Change |
|---|---|---|---|
| Overall height | 26.9" | 26.2" | -2.6 % |
| Sidewall | 4.96" | 4.62" | -6.9 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 84.6" | 82.4" | -2.6 % |
| Revs per mile | 749 | 769 | +2.6 % |
| Axle height | 13.46" | 13.12" | -8.8 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 315/40R17. Fit 335/35R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 |
| 50 mph | 48.7 mph | -1.3 |
| 70 mph | 68.2 mph | -1.8 |
| 90 mph | 87.7 mph | -2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,744 on the road, so it over-counts by 256. At a true 70 mph the first turns 874 times a minute, the second 897.