I have been cycling for over 20 years and have never had this to happen. I had purchased some new Schwalbe Lugano gumwall tires, for a trip over the weekend. Well after my ride I put the bike in the car as I have always done, it was hot but never had issues before with extreme heat in car. Today I went to pump up the tires and inspected the front and back as usual and the rear tire was in a S shape and bulging. The front tire was as normal, I have never had this to happen and I have had many brands of tires. So any of you ever heard a tire doing this before, or did I just get a defected tire.