225/50R16 vs 215/55R16
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 | 225/50R16 | 215/55R16 | Change |
|---|---|---|---|
| Overall height | 24.9" | 25.3" | +1.8 % |
| Sidewall | 4.43" | 4.66" | +5.1 % |
| Section width | 225 mm | 215 mm | -4.4 % |
| Circumference | 78.1" | 79.5" | +1.8 % |
| Revs per mile | 811 | 797 | -1.8 % |
| Axle height | 12.43" | 12.66" | +5.8 mm |
| Approved rim width | 6–8.5" | 6–8" | overlap 6–8" |
Both are approved on a rim 6" to 8" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 225/50R16. Fit 215/55R16 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 | 71.3 mph | +1.3 |
| 90 mph | 91.6 mph | +1.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,182 on the road, so it under-counts by 182. At a true 70 mph the first turns 947 times a minute, the second 930.