285/55R20 vs 295/55R20
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 | 285/55R20 | 295/55R20 | Change |
|---|---|---|---|
| Overall height | 32.3" | 32.8" | +1.3 % |
| Sidewall | 6.17" | 6.39" | +3.5 % |
| Section width | 285 mm | 295 mm | +3.5 % |
| Circumference | 101.6" | 103.0" | +1.3 % |
| Revs per mile | 624 | 615 | -1.3 % |
| Axle height | 16.17" | 16.39" | +5.5 mm |
| Approved rim width | 8–10.5" | 8.5–11" | overlap 8.5–10.5" |
Both are approved on a rim 8.5" to 10.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 285/55R20. Fit 295/55R20 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.4 mph | +0.4 |
| 50 mph | 50.7 mph | +0.7 |
| 70 mph | 70.9 mph | +0.9 |
| 90 mph | 91.2 mph | +1.2 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,134 on the road, so it under-counts by 134. At a true 70 mph the first turns 728 times a minute, the second 718.
What drivers reported
285/55R20 carries 4 complaints. Nobody has filed one naming 295/55R20.