315/50R18 vs 335/45R18
Going from one to the other changes the overall height by -1.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/50R18 | 335/45R18 | Change |
|---|---|---|---|
| Overall height | 30.4" | 29.9" | -1.7 % |
| Sidewall | 6.20" | 5.94" | -4.3 % |
| Section width | 315 mm | 335 mm | +6.3 % |
| Circumference | 95.5" | 93.8" | -1.7 % |
| Revs per mile | 663 | 675 | +1.7 % |
| Axle height | 15.20" | 14.94" | -6.8 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 315/50R18. Fit 335/45R18 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.8 mph | -1.2 |
| 90 mph | 88.4 mph | -1.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,825 on the road, so it over-counts by 175. At a true 70 mph the first turns 774 times a minute, the second 788.