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Discussion Starter #1
New guy here looking for input on a sudden tire wear issue on my daughters 2008 Cobalt Sport. I had new tires installed a few months ago. After about 5000 miles both rear tires are worn down to the steel bands. Both tires show the same wear. Front tires still look new.

Normally this points to a suspension issue, but everything is still tight and solid. No broken springs, wheelbearings have no play or grinding, shocks seem ok. The car drives good with no strange noises or tracking issues. Since the car has 95,000 miles, I will probably go with new shocks springs and bearings anyway. The previous set of tires did not wear like this, and since the rear suspension is not adjustable (except for shims) I am at a loss for the sudden change.

One tire blew out and Discount Tire replaced it for free and even though it was obviously a wear issue. Could their be a bad batch of 205/50 R17 Pirelli? My daughter took the car for the first tire, I will take it back for the other one.

Anyway, thanks in advance for any ideas or comments.

wto
 

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As you know no real adjustment for the rear. But if you hit a good size pot hole you can bend the axle. Did it wear both tires inside treads?
 

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Discussion Starter #3 (Edited)
Yes, both tires wore evenly. Daughter does not remember hitting anything abnormally hard, but who knows. I will take it to a shop that can check it for me once I get everything replaced. I am OK with replacing these components at 95K even if they have some life left.

wto


[/url]Tire Wear by [email protected], on Flickr[/IMG]
 

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Does she maybe remember sliding against a curb last winter?

Get it checked first or you may have to take everything apart again to change the axle.

 

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Discussion Starter #5
Had the alignment checked today and got more confusing news - confusing in that it doesn't match the tire wear. All readings were in spec except the left rear tire toe-in.

Reading was -0.95 and spec is -.018 to 0.43. The plan is to change the wheel hub and use a 3/4 degree shim to get it close to spec. Hopefully it will be close enough. I assume the mounting plate on the axle got tweaked a bit by that curb that nobody remembers hitting. I don't want to change the axle. It looks relatively easy but I would rather not spend the $$.

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Was it fish tailing at higher speed? That's a lot of tire wear... and -95 is too much toe out and would produce inside tire wear. Was it the passenger side that was really out because that's usually the one that gets affected by bumping a curb. Really your daughter may not remember hitting a curb because I know mine doesn't.
 
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