315/35R17 vs 335/30R17
Going from one to the other changes the overall height by -3.0 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/35R17 | 335/30R17 | Change |
|---|---|---|---|
| Overall height | 25.7" | 24.9" | -3.0 % |
| Sidewall | 4.34" | 3.96" | -8.8 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 80.7" | 78.3" | -3.0 % |
| Revs per mile | 785 | 810 | +3.0 % |
| Axle height | 12.84" | 12.46" | -9.8 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 315/35R17. Fit 335/30R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.1 mph | -0.9 |
| 50 mph | 48.5 mph | -1.5 |
| 70 mph | 67.9 mph | -2.1 |
| 90 mph | 87.3 mph | -2.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,701 on the road, so it over-counts by 299. At a true 70 mph the first turns 916 times a minute, the second 944.
What drivers reported
315/35R17 carries 1 complaints. Nobody has filed one naming 335/30R17.