Tire rotations are one of the easiest auto maintenance tasks to accomplish. It is also very important. Done properly, it can extend the life of your tires. It can also improve your gas mileage. Properly rotated tires ensure that your car handles in a steady and predictable manner when you need to make a sudden turn or stop.
Why rotations are needed
If you left all four tires in the same corner of your car for years and years, some tires would wear out faster than others. Worse, some of the treads in individual tires could wear unevenly, with the inside or outside wearing out first. Uneven tread wear is unavoidable. The weight of a car is not distributed evenly to all four corners. The engine, the heaviest single thing in a car, is usually at the front, so the front tires tend to carry more weight. The front tires also take care of all the steering duties.