305/40R22 vs 295/45R22
Going from one to the other changes the overall height by +2.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 305/40R22 | 295/45R22 | Change |
|---|---|---|---|
| Overall height | 31.6" | 32.5" | +2.7 % |
| Sidewall | 4.80" | 5.23" | +8.8 % |
| Section width | 305 mm | 295 mm | -3.3 % |
| Circumference | 99.3" | 102.0" | +2.7 % |
| Revs per mile | 638 | 621 | -2.7 % |
| Axle height | 15.80" | 16.23" | +10.8 mm |
| Approved rim width | 8.5–11" | 8.5–11" | overlap 8.5–11" |
Both are approved on a rim 8.5" to 11" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 305/40R22. Fit 295/45R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.8 mph | +0.8 |
| 50 mph | 51.3 mph | +1.3 |
| 70 mph | 71.9 mph | +1.9 |
| 90 mph | 92.4 mph | +2.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,268 on the road, so it under-counts by 268. At a true 70 mph the first turns 744 times a minute, the second 725.
What drivers reported
305/40R22 carries 7 complaints. Nobody has filed one naming 295/45R22.