235/45R19 vs 215/45R19
Going from one to the other changes the overall height by -2.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 235/45R19 | 215/45R19 | Change |
|---|---|---|---|
| Overall height | 27.3" | 26.6" | -2.6 % |
| Sidewall | 4.16" | 3.81" | -8.5 % |
| Section width | 235 mm | 215 mm | -8.5 % |
| Circumference | 85.8" | 83.6" | -2.6 % |
| Revs per mile | 738 | 758 | +2.6 % |
| Axle height | 13.66" | 13.31" | -9.0 mm |
| Approved rim width | 6.5–8.5" | 6–8" | overlap 6.5–8" |
Both are approved on a rim 6.5" to 8" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 235/45R19. Fit 215/45R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 |
| 50 mph | 48.7 mph | -1.3 |
| 70 mph | 68.2 mph | -1.8 |
| 90 mph | 87.7 mph | -2.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,741 on the road, so it over-counts by 259. At a true 70 mph the first turns 861 times a minute, the second 884.
What drivers reported
235/45R19 carries 8 complaints. Nobody has filed one naming 215/45R19.