265/40R16 vs 245/40R16
Going from one to the other changes the overall height by -2.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 265/40R16 | 245/40R16 | Change |
|---|---|---|---|
| Overall height | 24.3" | 23.7" | -2.6 % |
| Sidewall | 4.17" | 3.86" | -7.5 % |
| Section width | 265 mm | 245 mm | -7.5 % |
| Circumference | 76.5" | 74.5" | -2.6 % |
| Revs per mile | 828 | 850 | +2.6 % |
| Axle height | 12.17" | 11.86" | -8.0 mm |
| Approved rim width | 7.5–9.5" | 7–9" | 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 265/40R16. Fit 245/40R16 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 |
| 50 mph | 48.7 mph | -1.3 |
| 70 mph | 68.2 mph | -1.8 |
| 90 mph | 87.7 mph | -2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,741 on the road, so it over-counts by 259. At a true 70 mph the first turns 966 times a minute, the second 992.