OEM tires for the NSX wear out quickly. There are several reasons for rapid (not necessarily excessive) tire wear. Factory tires are a very soft, sticky compound. 1991-1992 NSX's came with different rear toe-in settings. With that setting Yokos driven on the street (not racetrack) typically get 5,000-8,000 miles to a set of rear A-022H tires, and usually at least double that for front tires. The '94+ models came with 16-inch front and 17 inch rear tires which last a little longer. The front tires tend to wear out first on the inside. Turn the steering wheel all the way to one side to inspect the full width of the tread. This wear is caused by both the toe-out and negative camber of the front end. See Alignment for more discussion of alignment.