215/80R16 vs 225/75R16
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 | 215/80R16 | 225/75R16 | Change |
|---|---|---|---|
| Overall height | 29.5" | 29.3" | -0.9 % |
| Sidewall | 6.77" | 6.64" | -1.9 % |
| Section width | 215 mm | 225 mm | +4.7 % |
| Circumference | 92.8" | 92.0" | -0.9 % |
| Revs per mile | 683 | 689 | +0.9 % |
| Axle height | 14.77" | 14.64" | -3.3 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 215/80R16. Fit 225/75R16 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.7 mph | -0.3 |
| 50 mph | 49.6 mph | -0.4 |
| 70 mph | 69.4 mph | -0.6 |
| 90 mph | 89.2 mph | -0.8 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,913 on the road, so it over-counts by 87. At a true 70 mph the first turns 796 times a minute, the second 803.
What drivers reported
Nobody has filed a complaint naming 215/80R16. 225/75R16 carries 121.