245/65R24 vs 265/55R24
Going from one to the other changes the overall height by -2.9 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 245/65R24 | 265/55R24 | Change |
|---|---|---|---|
| Overall height | 36.5" | 35.5" | -2.9 % |
| Sidewall | 6.27" | 5.74" | -8.5 % |
| Section width | 245 mm | 265 mm | +8.2 % |
| Circumference | 114.8" | 111.5" | -2.9 % |
| Revs per mile | 552 | 568 | +2.9 % |
| Axle height | 18.27" | 17.74" | -13.5 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 245/65R24. Fit 265/55R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.1 mph | -0.9 |
| 50 mph | 48.5 mph | -1.5 |
| 70 mph | 68.0 mph | -2.0 |
| 90 mph | 87.4 mph | -2.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,709 on the road, so it over-counts by 291. At a true 70 mph the first turns 644 times a minute, the second 663.