I would expect the Michelin Sport Cups to work better for the track because it's a whole different league of tire. It's much more of a race tire than the 555R2's. It doesn't have any tread to speak of. The 555R2's are more of a street tire and the Pilot Sport Cups are more of a race tire.
Just look at the difference.
Michelin Pilot Sport Cup
Nitto 555R2 (This is the 555R drag radial, but the tread looks similar)
The Pilot Sport Cups are closer to something like a Kumho V710 and the Nitto's are closer to a street tire. The Pilot Cup Sports and the Kumho V710's are both DOT approved and street legal, but I wouldn't drive either on the street.
Kumho V710 (DOT approved as well)
Does anyone know the wear ratings on the Michelin's? I know that they last a long time for a track tire, but I don't know how long they'd last if you actually drove them on the street.
Sal
