To your point, the new Vette runs a 305 rear and previous versions came equipped with rear cross-sections as wide as 335. IMHO a lot of that was just ePeen contests to say who had the wider tires.
My 2006 Corvette Z06 had 325/30R19 rear tires... because it had a hand built 7.1liter / 428.7 c.i. / 7,000 rpm racing motor
in the front that produced 505 h.p. (documented 449 h.p. at the wheels) and 470 lb-ft to the REAR WHEELS ONLY ("
RWD") propelling a super light
3,133 lb. car. The Z06's WIDE tires weren't for an "ePeen contest"... They provided the desperately needed LARGE tire contact area to try to keep the rear tires from simply spinning when launched. Even with these steamroller super wide rear tires it was an art to launch it since spinning the tires triggered the Z06's "Active Handling" and "Traction Control" systems which pulled timing that would almost stall the motor.
C6 Z06's also ONLY came with a manual transmission and NO launch control. Trick to launch it was rev it to 2,000 rpms then drop (not feather) the clutch... and then roll on the power. Too much and you'd lose traction... and then shift to 2nd ~ 60 mph being careful to feather the throttle again so you didn't spin the rear tires and lose control or have "Active Handling" and "Traction Control" systems kick in again. If you got all that right you could do 0 to 60 in just over 4 seconds.
Amazing myLucidrous
P85D can do 0 to 60 in 3 seconds... with ZERO drama and little skill. So much safer since it's AWD and the computer controls the torque. Brilliant!
New Corvette is a mid-engine car so doesn't need as wide of rear tires... Until Chevrolet introduces their performance model like the previous Z06 or ZR-1. Then they'll almost assuredly use super wide rear tires again.