I had a rough commute here on Tuesday. 3 rear flats total. 1st one was in the dark on the way to work. It blew and I had to change it in the dark. I found where it blew and felt the inside of the tire but could not find anything penetrating. I figured I just ran over something and left it in the road. I changed it and was 10 minutes late to work. Then on my way home (pouring rain and about 10 degrees cooler than the morning) I realized that it was going flat again. I managed to nurse it into the next town to a bike shop. I bought a new tube and they let me use their stand to change it. The leak in the tube was in the same spot as the morning. I checked the tire very closely this time and found a small amount of glass embedded in it but it didn't seem to be coming through the tire. I removed the glass, installed the tube and went on my way. About 1/4 mile out of town it blew again! I turned around, walked back into town and bought a new Continental and tube and paid them $5 to install it (My hands were frozen and I was sick of taking my rear tire off by that point). In the dark, I rode into Portland and to my home. My 1 1/4 hour commute home took over 2 1/2 hours! Then I had to sit around all night and watch those returns. It was a tough day all the way around.

nate