This happened suddenly. I just took it out one day and it started doing that. Didn't do any stunts either since it was a test day for my Dewalt motor. I always store the tires while flat with the inside of the rim on the floor or on the truck with it sitting on this stand I have. I don't think heat was the problem since they were always mounted since I used them more than the stock tires and were near the air purification thingy and was usually on during the summer. Is 80 degrees exessive for a room since that was normal temp this summer for my room. This did start during the summer. Pic-
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If you can see it there are three metal sticks all vertical getting closer to each other towards the top. They are screwed into a ring and the trucks center skid is sitting on that with the suspension not compressed.