Those are the only tires you can get with a Z/28 from the factory. They have 80 tread wear rating, but still, are the only option. It's a track car; it comes with track tires. The thing doesn't even have 2 speakers or an A/C if you don't order it with one. You expect them to sell it with trackable street tires instead of streetable track tires?
edit: The Boss 302 LS had even shorter lasting track tires from the factory. Were they cheater tires too?
It's a 60 treadwear rating, not to nit-pick
too much.
TR Source.
The point being made (at least by me) is that comparing a bunch of cars with a wide variance in tires, something that WILL be replaced or upgraded in a relatively short amount of time, is quite silly. Hell, changing between various flavors of R-comps can result in several seconds difference in lap time on shorter tracks. Going from the 60 treadwear tires on the Z28 to the 220 treadwear tires on the 911 Turbo S (the next slowest car) will make a HUGE difference.
I'm not saying the designers were right or wrong to put super-sticky rubber on a car like that. I am saying the comparison's lap times, and specifically the Z28's ranking, means very little when comparing these cars because the tires can, and will, be very different in the wild.