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I have about 18,000 miles on my 2012 V Sedan. Original front tires still fitted, but I am replacing them next week. My concern is that when I approach 70 - 80 miles per hour, I begin to feel a slight roughness coming from the front end. It doesn't feel like wheels out balance because the steering wheel doesn't shake. It just feels rough. Is there anything I should have the service guys check when I bring it in. Could it be wheel bearings, suspension, or something else? Perhaps the tires are so badly worn that they are causing this? I don't think they will be willing to replicate the problem since it occurs above the speed limit.
 

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2011 CTS-V A6 Sedan Modded :)
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Original PS2's? If so I would think the tires are the cause. My originals got pretty rough over 10K miles. On a more positive note, the PSS's have better traction and last a lot longer.
 

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11 Black Diamond Edition CTS-V Coupe, 12 SRX, 18 Ridgeline RTL-E
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All four PS2's, on my 2011 Coupe, were cupped at 3K miles. The car had been sitting in a cold (below freezing) garage throughout a winter. I suspect that the low temperatures, storage time, and summer compound each contributed. Alignment and balance were OK. The car was about two years old at that point.
 

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If your wheel doesn't shake, your front balance is fine. Are you sure it's in the front end?

I would recommend just getting the new tires and an alignment. Let the shop know what you've felt. Get it back and go from there.
 
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