315/45R17 vs 335/45R17
Going from one to the other changes the overall height by +2.5 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/45R17 | 335/45R17 | Change |
|---|---|---|---|
| Overall height | 28.2" | 28.9" | +2.5 % |
| Sidewall | 5.58" | 5.94" | +6.3 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 88.5" | 90.7" | +2.5 % |
| Revs per mile | 716 | 699 | -2.5 % |
| Axle height | 14.08" | 14.44" | +9.0 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 315/45R17. Fit 335/45R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.3 mph | +1.3 |
| 70 mph | 71.8 mph | +1.8 |
| 90 mph | 92.3 mph | +2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,252 on the road, so it under-counts by 252. At a true 70 mph the first turns 836 times a minute, the second 815.