235/75R19 vs 225/75R19
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 | 235/75R19 | 225/75R19 | Change |
|---|---|---|---|
| Overall height | 32.9" | 32.3" | -1.8 % |
| Sidewall | 6.94" | 6.64" | -4.3 % |
| Section width | 235 mm | 225 mm | -4.3 % |
| Circumference | 103.3" | 101.4" | -1.8 % |
| Revs per mile | 613 | 625 | +1.8 % |
| Axle height | 16.44" | 16.14" | -7.5 mm |
| Approved rim width | 6.5–8.5" | 6–8.5" | overlap 6.5–8.5" |
Both are approved on a rim 6.5" to 8.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 235/75R19. Fit 225/75R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.7 mph | -1.3 |
| 90 mph | 88.4 mph | -1.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,820 on the road, so it over-counts by 180. At a true 70 mph the first turns 716 times a minute, the second 729.