235/40R22 vs 245/35R22
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 | 235/40R22 | 245/35R22 | Change |
|---|---|---|---|
| Overall height | 29.4" | 28.8" | -2.2 % |
| Sidewall | 3.70" | 3.38" | -8.8 % |
| Section width | 235 mm | 245 mm | +4.3 % |
| Circumference | 92.4" | 90.3" | -2.2 % |
| Revs per mile | 686 | 701 | +2.2 % |
| Axle height | 14.70" | 14.38" | -8.3 mm |
| Approved rim width | 6.5–8.5" | 7–9" | 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 235/40R22. Fit 245/35R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.3 mph | -0.7 |
| 50 mph | 48.9 mph | -1.1 |
| 70 mph | 68.5 mph | -1.5 |
| 90 mph | 88.0 mph | -2.0 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,779 on the road, so it over-counts by 221. At a true 70 mph the first turns 800 times a minute, the second 818.
What drivers reported
Nobody has filed a complaint naming 235/40R22. 245/35R22 carries 1.