285/60R17 vs 275/65R17
Going from one to the other changes the overall height by +2.0 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 285/60R17 | 275/65R17 | Change |
|---|---|---|---|
| Overall height | 30.5" | 31.1" | +2.0 % |
| Sidewall | 6.73" | 7.04" | +4.5 % |
| Section width | 285 mm | 275 mm | -3.5 % |
| Circumference | 95.7" | 97.6" | +2.0 % |
| Revs per mile | 662 | 649 | -2.0 % |
| Axle height | 15.23" | 15.54" | +7.8 mm |
| Approved rim width | 8–10.5" | 7.5–10" | overlap 8–10" |
Both are approved on a rim 8" to 10" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 285/60R17. Fit 275/65R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.6 mph | +0.6 |
| 50 mph | 51.0 mph | +1.0 |
| 70 mph | 71.4 mph | +1.4 |
| 90 mph | 91.8 mph | +1.8 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,200 on the road, so it under-counts by 200. At a true 70 mph the first turns 772 times a minute, the second 757.
What drivers reported
Nobody has filed a complaint naming 285/60R17. 275/65R17 carries 2.