Originally Posted by
GuessWhoCycling
I inspected at home this afternoon. Small pinhole on the outer but side edge. Inspected tire with light and magnifying glass. Can't find a thorn so all I can guess is that whatever the object was (rock?) caused some kind of pinch flat. It was also along the seam, small pinhole so who knows, could even be defect. But I have had the same tube in there for quite some time. Maybe it just decided to fail?
Just glad the tire is OK.
Definitely a pinch flat, especially since it started losing air right after you hit the rock. The tube's not defective and didn't just decide to fail. Just patch it and use it as your spare.