215/75R20 vs 205/75R20
Going from one to the other changes the overall height by -1.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 215/75R20 | 205/75R20 | Change |
|---|---|---|---|
| Overall height | 32.7" | 32.1" | -1.8 % |
| Sidewall | 6.35" | 6.05" | -4.7 % |
| Section width | 215 mm | 205 mm | -4.7 % |
| Circumference | 102.7" | 100.9" | -1.8 % |
| Revs per mile | 617 | 628 | +1.8 % |
| Axle height | 16.35" | 16.05" | -7.5 mm |
| Approved rim width | 6–8" | 5.5–7.5" | overlap 6–7.5" |
Both are approved on a rim 6" to 7.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 215/75R20. Fit 205/75R20 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.7 mph | -1.3 |
| 90 mph | 88.4 mph | -1.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,819 on the road, so it over-counts by 181. At a true 70 mph the first turns 720 times a minute, the second 733.