205/80R18 vs 215/75R18
Going from one to the other changes the overall height by -0.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 205/80R18 | 215/75R18 | Change |
|---|---|---|---|
| Overall height | 30.9" | 30.7" | -0.7 % |
| Sidewall | 6.46" | 6.35" | -1.7 % |
| Section width | 205 mm | 215 mm | +4.9 % |
| Circumference | 97.1" | 96.4" | -0.7 % |
| Revs per mile | 652 | 657 | +0.7 % |
| Axle height | 15.46" | 15.35" | -2.8 mm |
| Approved rim width | 5.5–7.5" | 6–8" | 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 205/80R18. Fit 215/75R18 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.8 mph | -0.2 |
| 50 mph | 49.6 mph | -0.4 |
| 70 mph | 69.5 mph | -0.5 |
| 90 mph | 89.4 mph | -0.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,930 on the road, so it over-counts by 70. At a true 70 mph the first turns 761 times a minute, the second 767.