315/60R17 vs 335/55R17
Going from one to the other changes the overall height by -1.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/60R17 | 335/55R17 | Change |
|---|---|---|---|
| Overall height | 31.9" | 31.5" | -1.2 % |
| Sidewall | 7.44" | 7.25" | -2.5 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 100.2" | 99.0" | -1.2 % |
| Revs per mile | 633 | 640 | +1.2 % |
| Axle height | 15.94" | 15.75" | -4.8 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 315/60R17. Fit 335/55R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.6 mph | -0.4 |
| 50 mph | 49.4 mph | -0.6 |
| 70 mph | 69.2 mph | -0.8 |
| 90 mph | 88.9 mph | -1.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,883 on the road, so it over-counts by 117. At a true 70 mph the first turns 738 times a minute, the second 747.