315/65R24 vs 335/65R24
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 | 315/65R24 | 335/65R24 | Change |
|---|---|---|---|
| Overall height | 40.1" | 41.1" | +2.6 % |
| Sidewall | 8.06" | 8.57" | +6.3 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 126.0" | 129.3" | +2.6 % |
| Revs per mile | 503 | 490 | -2.6 % |
| Axle height | 20.06" | 20.57" | +13.0 mm |
| Approved rim width | 8.5–11.5" | 9.5–12.5" | overlap 9.5–11.5" |
Both are approved on a rim 9.5" to 11.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 315/65R24. Fit 335/65R24 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.3 mph | +1.3 |
| 70 mph | 71.8 mph | +1.8 |
| 90 mph | 92.3 mph | +2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,255 on the road, so it under-counts by 255. At a true 70 mph the first turns 586 times a minute, the second 572.