Senior Member (Retired)
Join Date: Sep 2001
Location: Great North Woods
Bikes: Vittorio, Centaur triple; Casati Laser Piu, Chorus Triple.
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OK, let me try.
1. Prior to putting the tube into the tire, you pumped it up.
2. When you did, one part developed a bulge.
Sounds like it would be OK, and maybe you pumped it up too much. Or, quite possibly, when unrestrained by the tire, they all do that because some parts are thinner than others.