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Sounds to me like the bead (the part of the tire which seats in the rim) has seen better days. This is like a thin steel cable molded in the tire. Cut a cross-section of an old tire which you would otherwise throw away with a hacksaw to see the bead.


Those appear to be hooked rims,(difficult to see in the pic) which are almost all iso-622. iso-630 rims are usually straight sided rims and used only on 25-50 year old road bikes. Occasionally tires are just made with tighter bead wires. You must fully deflate the tire and break the bead seal all the way around on both sides so that the edges farthest from ...

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