245/80R15 vs 265/70R15
Going from one to the other changes the overall height by -2.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 245/80R15 | 265/70R15 | Change |
|---|---|---|---|
| Overall height | 30.4" | 29.6" | -2.7 % |
| Sidewall | 7.72" | 7.30" | -5.4 % |
| Section width | 245 mm | 265 mm | +8.2 % |
| Circumference | 95.6" | 93.0" | -2.7 % |
| Revs per mile | 663 | 681 | +2.7 % |
| Axle height | 15.22" | 14.80" | -10.5 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 245/80R15. Fit 265/70R15 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 |
| 50 mph | 48.6 mph | -1.4 |
| 70 mph | 68.1 mph | -1.9 |
| 90 mph | 87.6 mph | -2.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,728 on the road, so it over-counts by 272. At a true 70 mph the first turns 773 times a minute, the second 795.
What drivers reported
Nobody has filed a complaint naming 245/80R15. 265/70R15 carries 33.