fine for commuters and even sporty vehicles
truly high performance cars need lots of rubber contact
Tire sizes for both the Z06 and Z07 package are increased to 275/30R20 front and 345/25R21 rear tires. (Fun fact: A stack of these tires now stands taller than the Corvette they fit.) The Z06 tire is a Michelin Pilot Sport 4S, with the Z07 package getting Pilot Sport Cup 2R tires that represent a huge step forward in technology. After a development program that is believed to have set a Michelin record for the greatest number of design iterations, the team is finding that at many tracks, the last lap of a 12-lap session is the fastest.
Even the tire pressure strategy changes, with the main Z06 adhering to the long-held Corvette tradition of 30 psi front and rear, to 35 psi front and rear with the Z07 package for street use. This changes the contact patch from rectangular to slightly ovoid, which reportedly improves wet traction. The track recommendation is for a cold setting of 24 psi front and rear. A third recommendation is coming for sustained autobahn or long-track (Nürburgring) usage.
