There is an answer. Even if you have 18"/19" wheels, the spare tire will still work, as long as you don't have larger aftermarket brake calipers. And regardless of your wheel size, the spare compartment won't fit ANY regular size tire. The car is designed so that when you use the spare, you put the regular tire you remove into the trunk, not under the hood. Any NSX front tire will fit into the trunk. The NSX rear tires in the stock sizes will fit, too; if you have aftermarket rear wheels and/or non-stock-size rear tires, fitting in the trunk depends on the size. As an alternative, you should be able to fit any size tire upright on the passenger seat (as long as there's no passenger there, of course). If you depend on doing this, you may want to bring an oversized plastic garbage bag in your trunk so that you don't get your seat dirty if you have to resort to this.
