Quote Originally Posted by Skierchickie View Post
This happened to me twice last summer, although I wouldn't say that it broke off so much as SHOT off. Never found it either time. Using a Park floor pump both times. I chalked it up to the quality of the tube. I believe they were both Q-Tubes, so I avoid those now.
That's kind of what I was thinking. Poor quality tubes. This is the first time it happened to me with any of my three bikes.