I just had two tubes blow in my face. I attributed the first one to the really trashed condition of the old tire that came on the bike. I was trying to confirm that the bike it was on would work OK permanently mounted on a trainer. I figured the fabric and rubber separated from the bead, allowed the tube to come out and blew out. I removed a tire and tube from another 27 x 1 1/4 rim that I knew have worked flawlessly for over a year. I'll be damned if it didn't blow up in my face as I mounted the bike onto the trainer, I could see the tire come out of the rim and the tube blewout. That's when I decided to investigate. I had previously checked that the rim liner was intact, no spokes were sticking out, and no debris was sticking in the rim. I had a dim memory of reading about smooth sided rims that have no means of seating the bead on a tire, and that is what this thing is. It is an old Campy rim and hub. It is otherwise unmarked as to size. The original tire was marked 630/ 27 x 1 1/4.
What type of tire is required to use with a beadless rim? I searched Sheldon's site and the BF archive, but they seem silent on the subject.
Thanks for your help, and speak loudly when you respond, I seem to be having difficulty hearing just now.