Originally Posted by USAZorro
Two years ago, I hadn't either. They are much less common now than they were 20+ years ago.
The TUBE is not stitched together. The high-tensile fabric carcass of the tire is stitched closed with the hopefully airtight tube inside it to contain the air pressure. The result is the same as that of the beads of a clincher holding on to the rim edges.
Ken