The Second Generation Acura NSX is equipped with 245/35-19 and 305/30-20 tires. This is the ideal size for both factory wheels as well as wheels like the forged Titan 7 T-S5 from ScienceofSpeed.
Tires for 19/20" wheels for the street:
The standard factory tire is the Continental ContiSportContact 5P. This tire has a 240 treadwear rating. New to the market and available in factory sizes is the new Pirelli P Zero PZ4 model with a 220 treadwear rating. Also just out from Michelin is the Pilot Sport 4S. This tire is the replacement for the popular Pilot Super Sport. The treadwear rating from Michelin is 300 - however, Michelin seems to always "over-rate" their treadwear - in comparison, this tire is likely more like a 200-240 treadwear from other manufacturers.
Tires for 19/20" wheels for the track:
The factory optional tire is the Pirelli Trofeo R. This is a high-performance track & competition tire not ideally suited for the street in wet conditions where the tire will be more prone to hydroplaning. However, if you want the best for the track, this is an excellent choice.
Tires for 20/21" wheels:
For 20"/ 21" wheels with factory width (8.5" front, 11" rear), the Pirelli P Zero & Michelin Pilot Sport 4S are available in 245/30-20 & 305/25-21.
For wheels with wider widths (20x9.0 & 21x12-12.5) Pirelli P Zero & Michelin Sport 4S are available in 255/30-20 & 325/25-21. These tires do not rub if the proper offsets are used.