235/45R22 vs 225/50R22
Going from one to the other changes the overall height by +1.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 235/45R22 | 225/50R22 | Change |
|---|---|---|---|
| Overall height | 30.3" | 30.9" | +1.8 % |
| Sidewall | 4.16" | 4.43" | +6.4 % |
| Section width | 235 mm | 225 mm | -4.3 % |
| Circumference | 95.3" | 96.9" | +1.8 % |
| Revs per mile | 665 | 654 | -1.8 % |
| Axle height | 15.16" | 15.43" | +6.8 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 235/45R22. Fit 225/50R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.5 mph | +0.5 |
| 50 mph | 50.9 mph | +0.9 |
| 70 mph | 71.2 mph | +1.2 |
| 90 mph | 91.6 mph | +1.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,175 on the road, so it under-counts by 175. At a true 70 mph the first turns 776 times a minute, the second 763.