Join Date: Jun 2013
Location: Santa Barbara, CA,
Contact with the tire doesn't bother me a ton if it's slight. My bike did that from new at the slightly looser than spec setting my dealer liked to use. Went away for me when I ditched the stock tires, they must have been slightly wider at the shoulder than any of my replacements.
Contact with the cat is a little more worrisome for me, as I've never experienced that even when I had contact with the tire. Got pictures? That kind of suggests to me that the chain was run way too loose for a while and it's possible that there's chain wear just from that metal to metal contact.