Join Date: Feb 2001
Location: Ft. Walton Beach, FL
555R2 is a race compound not to be confused with the regular 555 which is just a street tire (which are really nice btw). I have never tried an NT05, but even with the progression of technology, it can't be better than the 555R2. Could it be close? Possible, but I have no experience. In regards to NT01 vs 555R2, the rumor is the compounds are the same between those and even Toyo RA1's and R888s. The difference is in the tread and carcas construction. The 555R2 is also a more streetable tire (quiet) with more tread depth. It is popular for those that want a civilized ride to the track and still be able to run aggressively on track (which it does beautifully). The NT01 is a more track dedicated tire and is not as streetable (noisy tire) and has shallower tread. It will look like a slick before the tire is even worn out and they become dangerous in the rain. The 555R2 will have tread longer and so it will not be affected as easily. Track times should be similar but with the edge going to the NT01.
2012 Race Red GT
1998 Black GT (Open Track car) - TF 44cc Heads/Aviator SB, HP cams, BBK shorties, Delta Force tuning, MM Panhard LCA FCA Full subs CC plates coilovers, Koni Yellows, drop spindles, Brembo/Cobra brakes, 3.73 gears, truetrac diff
Track Videos - http://www.youtube.com/cxavier68