315/35R22 vs 335/30R22
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 | 315/35R22 | 335/30R22 | Change |
|---|---|---|---|
| Overall height | 30.7" | 29.9" | -2.5 % |
| Sidewall | 4.34" | 3.96" | -8.8 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 96.4" | 94.0" | -2.5 % |
| Revs per mile | 657 | 674 | +2.5 % |
| Axle height | 15.34" | 14.96" | -9.8 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 315/35R22. Fit 335/30R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 |
| 50 mph | 48.7 mph | -1.3 |
| 70 mph | 68.2 mph | -1.8 |
| 90 mph | 87.7 mph | -2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,750 on the road, so it over-counts by 250. At a true 70 mph the first turns 767 times a minute, the second 787.