235/70R14 vs 215/75R14
Going from one to the other changes the overall height by -0.9 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 235/70R14 | 215/75R14 | Change |
|---|---|---|---|
| Overall height | 27.0" | 26.7" | -0.9 % |
| Sidewall | 6.48" | 6.35" | -2.0 % |
| Section width | 235 mm | 215 mm | -8.5 % |
| Circumference | 84.7" | 83.9" | -0.9 % |
| Revs per mile | 748 | 755 | +0.9 % |
| Axle height | 13.48" | 13.35" | -3.3 mm |
| Approved rim width | 6.5–8.5" | 6–8" | overlap 6.5–8" |
Both are approved on a rim 6.5" to 8" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 235/70R14. Fit 215/75R14 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.7 mph | -0.3 |
| 50 mph | 49.5 mph | -0.5 |
| 70 mph | 69.3 mph | -0.7 |
| 90 mph | 89.1 mph | -0.9 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,905 on the road, so it over-counts by 95. At a true 70 mph the first turns 873 times a minute, the second 881.
What drivers reported
Nobody has filed a complaint naming 235/70R14. 215/75R14 carries 11.