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The Z06 comes with two different sets of tires, the Michelin Pilot Sport tires on the entry level and on that level with the optional "aero package," and the different Michelin Pilot Sport Cup tires only found on the Z07 package. The tread wear on the Pilot Sport Cup tires has a UTQG 80 rating, is primarily for track use (pictured below).
Here's a quote from GM's original press release:
"To deliver the levels of grip needed for the Z06's performance targets, the Z06 was fitted with larger Michelin tires (Pilot Sport tires for the Z06; Sport Cup tires with the Z07 package). The P285/30ZR19 front tires are 1.5 inches wider than the tires on the Stingray, while the 335/25ZR20 rear tires are two inches wider."
Tire Rack describes the Michelin Pilot Sport Cup 2 tires as:
"The Pilot Sport Cup 2 is Michelin’s Streetable Track & Competition tire originally developed for Original Equipment use on the Ferrari 458 Speciale, Mercedes SLS AMG Coupé Black Series and Porsche 918 Spyder hybrid super sports car. Designed to provide faster circuit times and consistent performance lap after lap, the Pilot Sport Cup 2 allows these supercars to achieve their full potential in dry conditions. Like all summer tires they are not intended to be driven in near-freezing temperatures, through slush, snow or on ice."
Took this picture on the Z06 "cutaway" car at NAIAS; picture of right rear tire.
Lest one think that "this can't be, that the tread is so worn down that this can not possibly be what comes on a Z07 package car, here's a picture, thanks to Tire Rack, of this tire in its "virgin state."
Here, also thanks to TireRack, is a comparison picture and specs of a representative Michelin Pilot Sports tires found on the non-Z07 package Z06 (though the actual tire picture and specs below are of the right rear tire found on a 2014 Z-51 StingRay). Note its 300 UTQG tread wear rating.
Here's a quote from GM's original press release:
"To deliver the levels of grip needed for the Z06's performance targets, the Z06 was fitted with larger Michelin tires (Pilot Sport tires for the Z06; Sport Cup tires with the Z07 package). The P285/30ZR19 front tires are 1.5 inches wider than the tires on the Stingray, while the 335/25ZR20 rear tires are two inches wider."
Tire Rack describes the Michelin Pilot Sport Cup 2 tires as:
"The Pilot Sport Cup 2 is Michelin’s Streetable Track & Competition tire originally developed for Original Equipment use on the Ferrari 458 Speciale, Mercedes SLS AMG Coupé Black Series and Porsche 918 Spyder hybrid super sports car. Designed to provide faster circuit times and consistent performance lap after lap, the Pilot Sport Cup 2 allows these supercars to achieve their full potential in dry conditions. Like all summer tires they are not intended to be driven in near-freezing temperatures, through slush, snow or on ice."
Took this picture on the Z06 "cutaway" car at NAIAS; picture of right rear tire.

Lest one think that "this can't be, that the tread is so worn down that this can not possibly be what comes on a Z07 package car, here's a picture, thanks to Tire Rack, of this tire in its "virgin state."

Here, also thanks to TireRack, is a comparison picture and specs of a representative Michelin Pilot Sports tires found on the non-Z07 package Z06 (though the actual tire picture and specs below are of the right rear tire found on a 2014 Z-51 StingRay). Note its 300 UTQG tread wear rating.
