265/65R17 vs 275/60R17
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 | 265/65R17 | 275/60R17 | Change |
|---|---|---|---|
| Overall height | 30.6" | 30.0" | -1.9 % |
| Sidewall | 6.78" | 6.50" | -4.2 % |
| Section width | 265 mm | 275 mm | +3.8 % |
| Circumference | 96.0" | 94.2" | -1.9 % |
| Revs per mile | 660 | 672 | +1.9 % |
| Axle height | 15.28" | 15.00" | -7.3 mm |
| Approved rim width | 7.5–9.5" | 7.5–10" | overlap 7.5–9.5" |
Both are approved on a rim 7.5" 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 265/65R17. Fit 275/60R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.4 mph | -0.6 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.7 mph | -1.3 |
| 90 mph | 88.3 mph | -1.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,813 on the road, so it over-counts by 187. At a true 70 mph the first turns 770 times a minute, the second 785.