To my eyes, the photos don't reveal dry rot. If the tires have spent more time exposed to the sun that not since they were installed, that would cause concern. If the tires were mine, I'd use them until they A) revealed dry rot, or b) wore out. How did I come to this opinion? I worked as a copywriter on Goodyear national advertising (newspaper/TV) from 1995 to 2002. Our ad agency team (J.Walter Thompson/Detroit) made multiple trips to Akron, OH to keep up with developments that would help us create ads that delivered tangible benefits and motivate people to shop Goodyear. So we spent a good amount of time picking the brains Goodyear engineers. And for those of you who believe advertising is dishonest, let me say that every ad I wrote had to have documented substantiation from said engineers, and go through TWO legal departments (JWT/Goodyear) before the public saw or heard a word.