235/55R22 vs 225/55R22
Going from one to the other changes the overall height by -1.3 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 235/55R22 | 225/55R22 | Change |
|---|---|---|---|
| Overall height | 32.2" | 31.7" | -1.3 % |
| Sidewall | 5.09" | 4.87" | -4.3 % |
| Section width | 235 mm | 225 mm | -4.3 % |
| Circumference | 101.1" | 99.7" | -1.3 % |
| Revs per mile | 627 | 635 | +1.3 % |
| Axle height | 16.09" | 15.87" | -5.5 mm |
| Approved rim width | 6.5–8.5" | 6–8.5" | overlap 6.5–8.5" |
Both are approved on a rim 6.5" 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 235/55R22. Fit 225/55R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.6 mph | -0.4 |
| 50 mph | 49.3 mph | -0.7 |
| 70 mph | 69.1 mph | -0.9 |
| 90 mph | 88.8 mph | -1.2 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,865 on the road, so it over-counts by 135. At a true 70 mph the first turns 731 times a minute, the second 741.