Originally Posted by fillthecup
My rear tire has started doing the same thing.
I've got a 1972 Schwinn Super Sport, rims are 27 X 1 1/4. I can put the tire on as gingerly as I'm able to, but no matter what I do beyond 60 psi the tire slowly comes off the rim, and if I let it go far enough the tube will then explode.
My LBS tried also, and it exploded for them too. They suggest a new rim, although there appears to be nothing wrong with mine at all.
So if they don't know why it's happening, does anyone here have any clues?
I'm very frustrated.
You need new rims. If your rims are the originals, then they are straight wall not hook bead rims. Usually you can get about 90 psi on these before you start to have problems, but your rims maybe are a bit smaller, or the tires a bit larger than average. A new set of hook bead rims will lock the tire bead in place and you won't have any more problems with tires slipping off the rims.