255/60R23 vs 235/60R23
Going from one to the other changes the overall height by -2.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 255/60R23 | 235/60R23 | Change |
|---|---|---|---|
| Overall height | 35.0" | 34.1" | -2.7 % |
| Sidewall | 6.02" | 5.55" | -7.8 % |
| Section width | 255 mm | 235 mm | -7.8 % |
| Circumference | 110.1" | 107.1" | -2.7 % |
| Revs per mile | 575 | 591 | +2.7 % |
| Axle height | 17.52" | 17.05" | -12.0 mm |
| Approved rim width | 7–9.5" | 6.5–8.5" | overlap 7–8.5" |
Both are approved on a rim 7" to 8.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 255/60R23. Fit 235/60R23 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 | 68.1 mph | -1.9 |
| 90 mph | 87.6 mph | -2.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,730 on the road, so it over-counts by 270. At a true 70 mph the first turns 671 times a minute, the second 690.