315/60R23 vs 335/60R23
Going from one to the other changes the overall height by +2.5 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/60R23 | 335/60R23 | Change |
|---|---|---|---|
| Overall height | 37.9" | 38.8" | +2.5 % |
| Sidewall | 7.44" | 7.91" | +6.3 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 119.0" | 122.0" | +2.5 % |
| Revs per mile | 532 | 519 | -2.5 % |
| Axle height | 18.94" | 19.41" | +12.0 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 315/60R23. Fit 335/60R23 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.7 mph | +0.7 |
| 50 mph | 51.2 mph | +1.2 |
| 70 mph | 71.7 mph | +1.7 |
| 90 mph | 92.2 mph | +2.2 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,249 on the road, so it under-counts by 249. At a true 70 mph the first turns 621 times a minute, the second 606.