265/40R17 vs 285/35R17
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 | 265/40R17 | 285/35R17 | Change |
|---|---|---|---|
| Overall height | 25.3" | 24.9" | -1.9 % |
| Sidewall | 4.17" | 3.93" | -5.9 % |
| Section width | 265 mm | 285 mm | +7.5 % |
| Circumference | 79.6" | 78.1" | -1.9 % |
| Revs per mile | 796 | 811 | +1.9 % |
| Axle height | 12.67" | 12.43" | -6.3 mm |
| Approved rim width | 7.5–9.5" | 8–10.5" | overlap 8–9.5" |
Both are approved on a rim 8" to 9.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 265/40R17. Fit 285/35R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.4 mph | -0.6 |
| 50 mph | 49.0 mph | -1.0 |
| 70 mph | 68.6 mph | -1.4 |
| 90 mph | 88.3 mph | -1.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,806 on the road, so it over-counts by 194. At a true 70 mph the first turns 928 times a minute, the second 947.
What drivers reported
265/40R17 carries 1 complaints. Nobody has filed one naming 285/35R17.