225/80R22 vs 225/85R22
Going from one to the other changes the overall height by +2.4 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 225/80R22 | 225/85R22 | Change |
|---|---|---|---|
| Overall height | 36.2" | 37.1" | +2.4 % |
| Sidewall | 7.09" | 7.53" | +6.3 % |
| Section width | 225 mm | 225 mm | 0.0 % |
| Circumference | 113.6" | 116.4" | +2.4 % |
| Revs per mile | 558 | 544 | -2.4 % |
| Axle height | 18.09" | 18.53" | +11.3 mm |
| Approved rim width | 6–8.5" | 6–8.5" | overlap 6–8.5" |
Both are approved on a rim 6" 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 225/80R22. Fit 225/85R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.7 mph | +0.7 |
| 50 mph | 51.2 mph | +1.2 |
| 70 mph | 71.7 mph | +1.7 |
| 90 mph | 92.2 mph | +2.2 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,245 on the road, so it under-counts by 245. At a true 70 mph the first turns 650 times a minute, the second 635.
What drivers reported
225/80R22 carries 1 complaints. Nobody has filed one naming 225/85R22.