235/35R19 vs 225/35R19
Going from one to the other changes the overall height by -1.1 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 235/35R19 | 225/35R19 | Change |
|---|---|---|---|
| Overall height | 25.5" | 25.2" | -1.1 % |
| Sidewall | 3.24" | 3.10" | -4.3 % |
| Section width | 235 mm | 225 mm | -4.3 % |
| Circumference | 80.0" | 79.2" | -1.1 % |
| Revs per mile | 792 | 800 | +1.1 % |
| Axle height | 12.74" | 12.60" | -3.5 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 235/35R19. Fit 225/35R19 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.7 mph | -0.3 |
| 50 mph | 49.5 mph | -0.5 |
| 70 mph | 69.2 mph | -0.8 |
| 90 mph | 89.0 mph | -1.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,892 on the road, so it over-counts by 108. At a true 70 mph the first turns 924 times a minute, the second 934.
What drivers reported
235/35R19 carries 6 complaints. Nobody has filed one naming 225/35R19.