Originally Posted by
TimothyH
It clearly failed along what is either a seam or mold mark. My guess is that it is a seam. I would not use these brand tubes any longer but would switch to something known to be seamless. Continental tubes are seamless. I'm sure there are others.
Dunno if this helps, but I turned it inside out. There are definitely marks visible inside, not sure if they are seams or not. The failure obviously followed one, though.