245/70R22 vs 225/80R22
Going from one to the other changes the overall height by +1.9 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 245/70R22 | 225/80R22 | Change |
|---|---|---|---|
| Overall height | 35.5" | 36.2" | +1.9 % |
| Sidewall | 6.75" | 7.09" | +5.0 % |
| Section width | 245 mm | 225 mm | -8.2 % |
| Circumference | 111.5" | 113.6" | +1.9 % |
| Revs per mile | 568 | 558 | -1.9 % |
| Axle height | 17.75" | 18.09" | +8.5 mm |
| Approved rim width | 7–9" | 6–8.5" | overlap 7–8.5" |
Both are approved on a rim 7" 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 245/70R22. Fit 225/80R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.6 mph | +0.6 |
| 50 mph | 50.9 mph | +0.9 |
| 70 mph | 71.3 mph | +1.3 |
| 90 mph | 91.7 mph | +1.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,189 on the road, so it under-counts by 189. At a true 70 mph the first turns 663 times a minute, the second 650.
What drivers reported
Nobody has filed a complaint naming 245/70R22. 225/80R22 carries 1.