285/65R24 vs 295/60R24
Going from one to the other changes the overall height by -1.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 285/65R24 | 295/60R24 | Change |
|---|---|---|---|
| Overall height | 38.6" | 37.9" | -1.7 % |
| Sidewall | 7.29" | 6.97" | -4.5 % |
| Section width | 285 mm | 295 mm | +3.5 % |
| Circumference | 121.2" | 119.2" | -1.7 % |
| Revs per mile | 523 | 532 | +1.7 % |
| Axle height | 19.29" | 18.97" | -8.3 mm |
| Approved rim width | 8–10.5" | 8.5–11" | overlap 8.5–10.5" |
Both are approved on a rim 8.5" to 10.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 285/65R24. Fit 295/60R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.2 mph | -0.8 |
| 70 mph | 68.8 mph | -1.2 |
| 90 mph | 88.5 mph | -1.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,832 on the road, so it over-counts by 168. At a true 70 mph the first turns 610 times a minute, the second 620.