I do a lot of tire and tube work and have learned to buy tubes only from agricultural outlets as they are thicker material. I have been working on a balloon tire bike project. Ordered 2 tires and tubes. One tube blew up at about 30 lbs so I put a patch on one of the old tubes that came from a tire marked 'A war tire-made from regenerated rubber'. It was maybe twice as thick and is holding it's own.