245/45R17 vs 265/45R17
Going from one to the other changes the overall height by +2.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 245/45R17 | 265/45R17 | Change |
|---|---|---|---|
| Overall height | 25.7" | 26.4" | +2.8 % |
| Sidewall | 4.34" | 4.69" | +8.2 % |
| Section width | 245 mm | 265 mm | +8.2 % |
| Circumference | 80.7" | 82.9" | +2.8 % |
| Revs per mile | 785 | 764 | -2.8 % |
| Axle height | 12.84" | 13.19" | +9.0 mm |
| Approved rim width | 7–9" | 7.5–9.5" | overlap 7.5–9" |
Both are approved on a rim 7.5" to 9" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 245/45R17. Fit 265/45R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.4 mph | +1.4 |
| 70 mph | 71.9 mph | +1.9 |
| 90 mph | 92.5 mph | +2.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,276 on the road, so it under-counts by 276. At a true 70 mph the first turns 916 times a minute, the second 892.
What drivers reported
245/45R17 carries 22 complaints. Nobody has filed one naming 265/45R17.