215/75R14 vs 225/75R14
Going from one to the other changes the overall height by +2.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 215/75R14 | 225/75R14 | Change |
|---|---|---|---|
| Overall height | 26.7" | 27.3" | +2.2 % |
| Sidewall | 6.35" | 6.64" | +4.7 % |
| Section width | 215 mm | 225 mm | +4.7 % |
| Circumference | 83.9" | 85.7" | +2.2 % |
| Revs per mile | 755 | 739 | -2.2 % |
| Axle height | 13.35" | 13.64" | +7.5 mm |
| Approved rim width | 6–8" | 6–8.5" | 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 215/75R14. Fit 225/75R14 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.7 mph | +0.7 |
| 50 mph | 51.1 mph | +1.1 |
| 70 mph | 71.5 mph | +1.5 |
| 90 mph | 92.0 mph | +2.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,221 on the road, so it under-counts by 221. At a true 70 mph the first turns 881 times a minute, the second 862.
What drivers reported
215/75R14 carries 11 complaints. Nobody has filed one naming 225/75R14.