Misalignment of the front or rear wheels can cause rapid or uneven wear. Front-wheel-drive vehicles and those with independent rear suspension require alignment of all four wheels, instead of two. Getting your alignment checked as specified in your vehicle's owner's manual is the recommended way to prolong tire life.
Sometimes irregular tire wear can be corrected by rotating your tires (see our Tire Rotation 101 page under the Service tab or Click Here ). If your tires show uneven wear, ask an expert at Markley Motors to check for and correct any misalignment, imbalance, or other mechanical problem involved before rotation.
A tire's tread directly affects how it grips the road, so it's
important to regularly inspect it visually for signs of uneven wear.
These signs can include high or low areas, or unusually smooth ones.
Here is an illustration on different types of wear patterns:

3401 S College Ave
3325 S College Ave
Fort Collins, CO 80525