
Your vehicle's tires should be replaced if:
* Any portion of the tread is worn to the "wear indicator bars"—lateral bars molded into the tire grooves at about 20 percent of their new tread depth—or to a depth, as measured in a groove, of 1/16th inch or less.
* Tread wear is severely uneven (in which case have the wheel alignment checked) or the center is worn much more than the edges (be more vigilant about tire pressures).
* The tire sidewalls are severely cracked or there are bulges anywhere on the tire.
* There is any indication of tread separation from the tire carcass.
* The tire has been punctured and cannot be satisfactorily repaired.
There are other reasons you may need new tires, as well. If you have been running on winter tires, then a change is in order in the spring. Using snow tires on dry roads accelerates their wear significantly and diminishes both traction and handling ability.

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