bsmcall said:
On my Goat, it's not the rotors. It is excessive inside tread wear due to the front alignment having too much negative camber. Turn the steering wheel all the way left, and examine the inside tread blocks on each tire. If they are uneven or visibly worn funny, rotate your tires from front to back, problem solved.
EXCEPT MY DEALER REFUSES TO CORRECT THE ALIGNMENT ISSUE THAT FORCES THE FRONT TIRES TO WEAR IN THAT FASHION.
This is a common comment on the Vette forums as well. Negative camber improves handling at the cost of inside tire wear if you don't drive hard enough to get similar outside edge wear. That said, excessive wear on the inside edge of the front tire doesn't indicate an alignment "problem" as much as indicate what the designer's thought process was: handling over wear.
In addition, the normal factory tolerance is pretty wide. I don't know the GTO numbers, but for example, the stock Z06 front camber is -0.7 +/- 0.5 degrees which means anywhere from -0.2 to -1.2 is "in" spec. That is a huge variance.
If you want less wear specify the dealer align your car to the low end of the GTO camber tolerace vice the middle or high end. They can hit camber within a tenth or so.
Another big impact for that front inner edge wear is the front toe setting. Toe in or out increases the wear due to "dragging" the tire along the ground. I suspect that zero front toe in is within spec. Setting front toe to zero again will sacrifice handling (less turn in and more understeer) but increase tire life.
On rotors...
I suspect most of your cars are still under warranty. But for those that aren't, or for those that would rather do your own work, check out NAPA for OEM rotor prices. For the Vette, best stock price is around $65-$75, NAPA is $25. The stock vette rotors are made in Brazil. I have been buying NAPA rotors for over a year now (I go through a lot on the track) and they have all been made in Canada or USA. :cheers