275/70R20 vs 265/70R20
Going from one to the other changes the overall height by -1.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 275/70R20 | 265/70R20 | Change |
|---|---|---|---|
| Overall height | 35.2" | 34.6" | -1.6 % |
| Sidewall | 7.58" | 7.30" | -3.6 % |
| Section width | 275 mm | 265 mm | -3.6 % |
| Circumference | 110.5" | 108.7" | -1.6 % |
| Revs per mile | 574 | 583 | +1.6 % |
| Axle height | 17.58" | 17.30" | -7.0 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 275/70R20. Fit 265/70R20 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.2 mph | -0.8 |
| 70 mph | 68.9 mph | -1.1 |
| 90 mph | 88.6 mph | -1.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,843 on the road, so it over-counts by 157. At a true 70 mph the first turns 669 times a minute, the second 680.
What drivers reported
Nobody has filed a complaint naming 275/70R20. 265/70R20 carries 2.