I just picked up a 1987/8 Schwinn with 700 rims. Since the otherwise good gumwalls had a couple dry rot spots on them I installed folding 700x23 tires rated to 125psi. The front tire blew out the side at 115 psi. After a very carefull reinstall it seemed fine. The rear tire seemed to seat properly and inflate to 120psi. After the maiden 10min ride and a 25mph descent, it blew out the side.
The Weinman rims seem to have a mild hook. I'm wondering what to check - maybe some sort of rim defect? Would non-folding tires with metal beads work better? I'm a clydesdale at 215lbs but I could live with 100 psi / 110 psi front/back if necessary.