Avon M550's Getting Cupped
 

Guys,

About 13k miles ago I put on a set of avon 235/50 17's. Well they're getting wicked cupped and making alot of road noise. I rotate every $6k miles and now every $3k now that they're f'd up. I took it to get it aligned and the alignment was right on. We speculated that I was running the tires underinflated at 30 psi. I bumped it up to 42 but they are getting worse. I'm hoping its cause once they start getting screwed up they just get worse and worse...rather than I have a problem I havent found. Has anyone experienced this? My concern is if I replace the tires and they do it again I'm out another $700.

Let me know your thoughts.

Sean