Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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If the bearings are bad that could possibly cause the cupped tires but usually its either just due to a cheap tire to begin with or worn out suspension. If these are the original tires they may just be worn out.
Do the tires look cupped? You dont have to take their word for it.. walk out and look at them. You got the tools to double check them on this one (at least I assume you have eyesight if you are driving) ;)
30k is not bad out of a set of tires on an AWD vehicle so it may just be their time but I would double check it to see if they really are cupped. Sounds like they think the bearings are making noise and they are just selling you tires on top of it for some reason.
You have zero legal recourse with GM over this. Its all normal wear items. You wont get anywhere with goodwill either at 30k. Your only hope is the dealer you bought it from helping you if you are a good enough customer and they want to keep it that way.
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