215/65R17 vs 235/55R17
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 | 215/65R17 | 235/55R17 | Change |
|---|---|---|---|
| Overall height | 28.0" | 27.2" | -3.0 % |
| Sidewall | 5.50" | 5.09" | -7.5 % |
| Section width | 215 mm | 235 mm | +9.3 % |
| Circumference | 88.0" | 85.4" | -3.0 % |
| Revs per mile | 720 | 742 | +3.0 % |
| Axle height | 14.00" | 13.59" | -10.5 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 215/65R17. Fit 235/55R17 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 9,705 on the road, so it over-counts by 295. At a true 70 mph the first turns 840 times a minute, the second 866.