(1) Hard Cornering/Underinflation
(2) Incorrect Alignment/Lack of Rotation
(3) Incorrect Alignment/Non-uniform Tire
(4) Heavy Acceleration/Over inflation
(5) Wear Indicator
Typical ties wear pattern pictures. Have front end steering components checked and a front end alignment after replacement.
Some typical tire wear patterns and the causes
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•  You can see the indicators at three or more places around the tire.

•  You can see cord or fabric showing through the tire's rubber.

•  The tread or sidewall is cracked, cut, or snagged deep enough to show
cord or fabric.

•  The tire has a bump, bulge, or split.

•  The tire has a puncture, cut, or other damage that cannot be repaired
well because of the size or location of the damage.

The rubber in tires degrades over time, even if they are not being used.
This is also true for the spare tire, if your vehicle has one. Multiple
conditions affect how fast this aging takes place, including temperatures,
loading conditions, and inflation pressure maintenance. With proper care
and maintenance tires will typically wear out before they degrade due to
age. If you are unsure about the need to replace your tires as they get
older, consult the tire manufacturer for more information.