245/60R16 vs 235/60R16
Going from one to the other changes the overall height by -1.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 245/60R16 | 235/60R16 | Change |
|---|---|---|---|
| Overall height | 27.6" | 27.1" | -1.7 % |
| Sidewall | 5.79" | 5.55" | -4.1 % |
| Section width | 245 mm | 235 mm | -4.1 % |
| Circumference | 86.6" | 85.1" | -1.7 % |
| Revs per mile | 731 | 744 | +1.7 % |
| Axle height | 13.79" | 13.55" | -6.0 mm |
| Approved rim width | 7–9" | 6.5–8.5" | overlap 7–8.5" |
Both are approved on a rim 7" to 8.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 245/60R16. Fit 235/60R16 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.8 mph | -1.2 |
| 90 mph | 88.5 mph | -1.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,829 on the road, so it over-counts by 171. At a true 70 mph the first turns 853 times a minute, the second 868.
What drivers reported
Nobody has filed a complaint naming 245/60R16. 235/60R16 carries 41.