I had two flats in two days. The one I had filling up the tire, the valve stem fell off, so I changed the tube and tonight I got glass in the tire on the way home from work. I was almost home and I kept hearing a hissing so I stopped and felt the glass in the tire. I rode it home and changed the tube. Besides that, it was a good ride. Hope I don't get any more flats for awhile. Have a good night.