205/80R14 vs 205/75R14
Going from one to the other changes the overall height by -3.0 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 205/80R14 | 205/75R14 | Change |
|---|---|---|---|
| Overall height | 26.9" | 26.1" | -3.0 % |
| Sidewall | 6.46" | 6.05" | -6.3 % |
| Section width | 205 mm | 205 mm | 0.0 % |
| Circumference | 84.6" | 82.0" | -3.0 % |
| Revs per mile | 749 | 773 | +3.0 % |
| Axle height | 13.46" | 13.05" | -10.3 mm |
| Approved rim width | 5.5–7.5" | 5.5–7.5" | overlap 5.5–7.5" |
Both are approved on a rim 5.5" 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 205/80R14. Fit 205/75R14 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.1 mph | -0.9 |
| 50 mph | 48.5 mph | -1.5 |
| 70 mph | 67.9 mph | -2.1 |
| 90 mph | 87.3 mph | -2.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,700 on the road, so it over-counts by 300. At a true 70 mph the first turns 874 times a minute, the second 901.
What drivers reported
Nobody has filed a complaint naming 205/80R14. 205/75R14 carries 69.