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In Reply to: To clarify... posted by ghost of olddude55 on July 14, 2020 at 16:36:06:
The ring molded into the sidewall is called the "bead" and it should lock into place once there is enough pressure. That's called "seating the bead." Once seated, the bead will stick to the rim even if the tire is subsequently deflated.
The bead is laterally flexible and having the rim out of true shouldn't prevent it from seating because it doesn't change the circumference of the rim. If the rim is very out of round due to unequal spoke tension, that could cause it to fail to seat properly, but I haven't seen that personally. On the other hand, if the rim has been dented by an impact, you may be SOL. If a dent has pushed the rim even a milimeter out of round, you can have problems seating the bead.
There's a minimum pressure needed to get the bead to seat. That varies based on tire and rim, but 45 PSI on a MTB or hybrid wheel should be more than enough. If the bead doesn't seat properly and you continue to inflate, at some point the tube may squeeze itself into the gap between bead and rim and then tear. That may have been what you experienced.
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Follow Ups
- RE: To clarify... - Dave_K 07/14/2018:19:28 07/14/20 (3)
- Think I found the problem... - ghost of olddude55 04:22:14 07/15/20 (2)
- Here's a tip - Dave_K 05:43:08 07/15/20 (1)
- I've been working on bikes since I was 7 or 8 years old. - ghost of olddude55 05:49:08 07/15/20 (0)
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