The tire rotation pattern advocated since the introduction of the steel-belted radial tire in the 1970s is pretty rigid, but it does ensure maximum wear from your tires. It is simply this: The front right tire is moved to the back right tire, while the back right is moved to the front. The same is done on the left-hand side. The reason for this has as much to do with the type of drive the cars use as anything else. With front drive, 69 percent of the weight of the car is over the front tires, and 31 percent is on the rear, so the rear tires are just dragged along for the ride. To even out wear, you must move the same side rears to the fronts at periodic intervals, and you should easily get 40,000 or 50,000 miles out of your tires.
For more info, see How Often Should You Replace Tires