215/65R16 vs 235/60R16
Going from one to the other changes the overall height by +0.4 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 215/65R16 | 235/60R16 | Change |
|---|---|---|---|
| Overall height | 27.0" | 27.1" | +0.4 % |
| Sidewall | 5.50" | 5.55" | +0.9 % |
| Section width | 215 mm | 235 mm | +9.3 % |
| Circumference | 84.8" | 85.1" | +0.4 % |
| Revs per mile | 747 | 744 | -0.4 % |
| Axle height | 13.50" | 13.55" | +1.3 mm |
| Approved rim width | 6–8" | 6.5–8.5" | 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 215/65R16. Fit 235/60R16 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.1 mph | +0.1 |
| 50 mph | 50.2 mph | +0.2 |
| 70 mph | 70.3 mph | +0.3 |
| 90 mph | 90.3 mph | +0.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,036 on the road, so it under-counts by 36. At a true 70 mph the first turns 871 times a minute, the second 868.