A tough day. Ended with Sonia getting her foot caught in the back wheel of Dan's bike on a downhill, one mile from the day's destination. Threw the bike into a hard skid with the wheel locked up, loud blow-out of the tube and destroyed the tire. Sonia ok but shaken up. Helped by a great guy, Sheldon, who had a bike in the woods behind his house and gave us a tire off of it, but a little too big and tube wouldn't stay inside the tire when inflated. Waiting to see if we can get a tire at a hardware store or a bike shop 50 miles away. More from Dan, the writer in the family, later.