335/55R22 vs 315/60R22
Going from one to the other changes the overall height by +1.0 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 335/55R22 | 315/60R22 | Change |
|---|---|---|---|
| Overall height | 36.5" | 36.9" | +1.0 % |
| Sidewall | 7.25" | 7.44" | +2.6 % |
| Section width | 335 mm | 315 mm | -6.0 % |
| Circumference | 114.7" | 115.9" | +1.0 % |
| Revs per mile | 552 | 547 | -1.0 % |
| Axle height | 18.25" | 18.44" | +4.8 mm |
| Approved rim width | 9.5–12.5" | 8.5–11.5" | 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 335/55R22. Fit 315/60R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.3 mph | +0.3 |
| 50 mph | 50.5 mph | +0.5 |
| 70 mph | 70.7 mph | +0.7 |
| 90 mph | 90.9 mph | +0.9 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,102 on the road, so it under-counts by 102. At a true 70 mph the first turns 645 times a minute, the second 638.