245/35R20 vs 225/40R20
Going from one to the other changes the overall height by +1.3 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 245/35R20 | 225/40R20 | Change |
|---|---|---|---|
| Overall height | 26.8" | 27.1" | +1.3 % |
| Sidewall | 3.38" | 3.54" | +5.0 % |
| Section width | 245 mm | 225 mm | -8.2 % |
| Circumference | 84.0" | 85.1" | +1.3 % |
| Revs per mile | 754 | 745 | -1.3 % |
| Axle height | 13.38" | 13.54" | +4.3 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 245/35R20. Fit 225/40R20 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.4 mph | +0.4 |
| 50 mph | 50.6 mph | +0.6 |
| 70 mph | 70.9 mph | +0.9 |
| 90 mph | 91.1 mph | +1.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,125 on the road, so it under-counts by 125. At a true 70 mph the first turns 880 times a minute, the second 869.
What drivers reported
245/35R20 carries 6 complaints. Nobody has filed one naming 225/40R20.