245/45R15 vs 265/45R15
Going from one to the other changes the overall height by +3.0 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 245/45R15 | 265/45R15 | Change |
|---|---|---|---|
| Overall height | 23.7" | 24.4" | +3.0 % |
| Sidewall | 4.34" | 4.69" | +8.2 % |
| Section width | 245 mm | 265 mm | +8.2 % |
| Circumference | 74.4" | 76.6" | +3.0 % |
| Revs per mile | 852 | 827 | -3.0 % |
| Axle height | 11.84" | 12.19" | +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 245/45R15. Fit 265/45R15 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.9 mph | +0.9 |
| 50 mph | 51.5 mph | +1.5 |
| 70 mph | 72.1 mph | +2.1 |
| 90 mph | 92.7 mph | +2.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,299 on the road, so it under-counts by 299. At a true 70 mph the first turns 994 times a minute, the second 965.
What drivers reported
Nobody has filed a complaint naming 245/45R15. 265/45R15 carries 1.