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I am having to get new tires for my GS because the rear tires wore to the cords on the inside of each tire in only 14,000 miles. I am having the Michelin Pilot AS 3+ tires installed tomorrow and I will also get a complete alignment, front and rear. Is anyone aware of any published alignment specs for a "street setting"? I drive the car only for pleasure and would like to get 30,000 miles or so out of the new tires.
With any decent alignment, the AS3+ should give you 30k miles with reasonable driving style.
The two things that eat the inside edges of tires are toe-out, and negative camber.
I believe toe-out is the more common problem (on my two new 'vettes), you want 0 toe or very slightly toe-in, unless you are an overcaffinated autocrosser.
Negative camber will improve your cornering ability on dry pavement, so there's a tradeoff. If you only care about tire life, then 0 camber. Most people report still getting good results with -.2' camber, I run -.6 on a Z51 and tire wear is more on the inner edges but an autocross weekend will "even it out" for a while.
Any alignment shop will have a table of alignment values, others here can give you their personal favorites.
You can't go badly wrong with 0 camber 0 toe and everything else toward the middle of the range.
Be aware that the C7 has adjustable caster in the rear suspension. Alignment machines can't measure that, it takes a special tool that some dealers have but not too many. That probably won't effect your tire life but can produce strange handling quirks.
Like you, our `19 Grand Sport had an alignment issue on the rear from the assembly plant. We caught ours early and had an alignment done to correct both camber and toe. Very little alignment needed on the front. Now with 12,000+ miles on the original Michelin PSS and showing even wear.
I also think camber alignment may help with the cracked wheels issue, but I usually get crucified when I argue that in the wheel threads.
Last edited by duckvett; Nov 23, 2020 at 02:00 PM.
Yesterday, Costco put on the new A/S 4s. Here's pics of the old C7 OEM Z51 tires. They have 16,000 miles on them and appear to be less than half worn. But, there was some deterioration inside the almost eight-year old tires tires. Looking at the pics, I don't know which are left/right. That's probably a good thing because there does not appear to be any un-even wear on all four. Steering wheel centered & they drive straight. Anybody see any reason to get an alignment? Thanks.
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Alignment Specs for 2019 Grandsport
