Blow-off! I got this while descending Jamison Creek Rd. The tire blew off just downhill from the bottom of the steep part, just as I was thinking I made it down without trouble. The tear is about 1/4" long and is between the embossed patterns of the cloth rim strip (right) and the tire bead (left), right where one would expect a blow-off to occur.
When I stopped I could smell hot rubber, and my rims had to be cooled with water before I could fix the flat.
