225/60R19 vs 215/65R19
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 | 225/60R19 | 215/65R19 | Change |
|---|---|---|---|
| Overall height | 29.6" | 30.0" | +1.3 % |
| Sidewall | 5.31" | 5.50" | +3.5 % |
| Section width | 225 mm | 215 mm | -4.4 % |
| Circumference | 93.1" | 94.3" | +1.3 % |
| Revs per mile | 681 | 672 | -1.3 % |
| Axle height | 14.81" | 15.00" | +4.8 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 225/60R19. Fit 215/65R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.4 mph | +0.4 |
| 50 mph | 50.6 mph | +0.6 |
| 70 mph | 70.9 mph | +0.9 |
| 90 mph | 91.1 mph | +1.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,126 on the road, so it under-counts by 126. At a true 70 mph the first turns 794 times a minute, the second 784.