225/70R19 vs 215/75R19
Going from one to the other changes the overall height by +0.9 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 225/70R19 | 215/75R19 | Change |
|---|---|---|---|
| Overall height | 31.4" | 31.7" | +0.9 % |
| Sidewall | 6.20" | 6.35" | +2.4 % |
| Section width | 225 mm | 215 mm | -4.4 % |
| Circumference | 98.7" | 99.6" | +0.9 % |
| Revs per mile | 642 | 636 | -0.9 % |
| Axle height | 15.70" | 15.85" | +3.8 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 225/70R19. Fit 215/75R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.3 mph | +0.3 |
| 50 mph | 50.5 mph | +0.5 |
| 70 mph | 70.7 mph | +0.7 |
| 90 mph | 90.8 mph | +0.8 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,094 on the road, so it under-counts by 94. At a true 70 mph the first turns 749 times a minute, the second 742.
What drivers reported
225/70R19 carries 7 complaints. Nobody has filed one naming 215/75R19.