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Although it’s common practice to stagger the wheel sizes by running wider wheels and tires in the rear, this can increase the understeer Mustangs possess from the factory. We were interested in balanced handling, so we ordered a quartet of 18x9.5-inch GT500 replica wheels from American Muscle. (PN 28072; $154.99/each) The larger wheels provide room for a big-brake upgrade in the future, and their extra width is perfect for the 275/40-18 Nitto NT-05s. (PN 207-050; $249.95/each) Another benefit to using the same size wheels and tires all the way around is that we can rotate the tires to manage tire wear.