285/60R24 vs 295/55R24
Going from one to the other changes the overall height by -1.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 285/60R24 | 295/55R24 | Change |
|---|---|---|---|
| Overall height | 37.5" | 36.8" | -1.8 % |
| Sidewall | 6.73" | 6.39" | -5.1 % |
| Section width | 285 mm | 295 mm | +3.5 % |
| Circumference | 117.7" | 115.5" | -1.8 % |
| Revs per mile | 538 | 548 | +1.8 % |
| Axle height | 18.73" | 18.39" | -8.8 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 285/60R24. Fit 295/55R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.4 mph | -0.6 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.7 mph | -1.3 |
| 90 mph | 88.3 mph | -1.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,816 on the road, so it over-counts by 184. At a true 70 mph the first turns 628 times a minute, the second 640.