275/65R16 vs 265/65R16
Going from one to the other changes the overall height by -1.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 275/65R16 | 265/65R16 | Change |
|---|---|---|---|
| Overall height | 30.1" | 29.6" | -1.7 % |
| Sidewall | 7.04" | 6.78" | -3.6 % |
| Section width | 275 mm | 265 mm | -3.6 % |
| Circumference | 94.5" | 92.9" | -1.7 % |
| Revs per mile | 671 | 682 | +1.7 % |
| Axle height | 15.04" | 14.78" | -6.5 mm |
| Approved rim width | 7.5–10" | 7.5–9.5" | 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 275/65R16. Fit 265/65R16 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.8 mph | -1.2 |
| 90 mph | 88.5 mph | -1.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,830 on the road, so it over-counts by 170. At a true 70 mph the first turns 782 times a minute, the second 796.
What drivers reported
Nobody has filed a complaint naming 275/65R16. 265/65R16 carries 5.