325/60R23 vs 335/55R23
Going from one to the other changes the overall height by -2.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 325/60R23 | 335/55R23 | Change |
|---|---|---|---|
| Overall height | 38.4" | 37.5" | -2.2 % |
| Sidewall | 7.68" | 7.25" | -5.5 % |
| Section width | 325 mm | 335 mm | +3.1 % |
| Circumference | 120.5" | 117.8" | -2.2 % |
| Revs per mile | 526 | 538 | +2.2 % |
| Axle height | 19.18" | 18.75" | -10.8 mm |
| Approved rim width | 9–12" | 9.5–12.5" | overlap 9.5–12" |
Both are approved on a rim 9.5" to 12" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 325/60R23. Fit 335/55R23 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.3 mph | -0.7 |
| 50 mph | 48.9 mph | -1.1 |
| 70 mph | 68.5 mph | -1.5 |
| 90 mph | 88.0 mph | -2.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,779 on the road, so it over-counts by 221. At a true 70 mph the first turns 613 times a minute, the second 627.