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spi...@ac...m.orgGot these because I was looking for a replacement for the old Pyramid thorn-resistant tubes that I can't seem to find anymore. I ran 'em for about two weeks, had to top off the air once, and then as the wife and I were talking a break halfway along our trail (no weight on the bike, no pressure problems previously on the ride) we heard a "pfffft" and watched my front tire rapidly deflate. The valve body separated from the rest of the tube, and that's all she wrote.