225/60R19 vs 215/60R19
Going from one to the other changes the overall height by -1.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 225/60R19 | 215/60R19 | Change |
|---|---|---|---|
| Overall height | 29.6" | 29.2" | -1.6 % |
| Sidewall | 5.31" | 5.08" | -4.4 % |
| Section width | 225 mm | 215 mm | -4.4 % |
| Circumference | 93.1" | 91.6" | -1.6 % |
| Revs per mile | 681 | 692 | +1.6 % |
| Axle height | 14.81" | 14.58" | -6.0 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 225/60R19. Fit 215/60R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.2 mph | -0.8 |
| 70 mph | 68.9 mph | -1.1 |
| 90 mph | 88.6 mph | -1.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,841 on the road, so it over-counts by 159. At a true 70 mph the first turns 794 times a minute, the second 807.