I am relatively new to the forum and serious bike riding, and as such had my first flat today. I had just about finished a short, fifteen mile ride when the flat occurred and I then walked the bike back to my house. I always have a phone with me, but didn't use it since I was so close to home. Anyway, after diligently searching for what caused the flat, I finally found a small piece of wire, like off a wire brush, which had made it thru the tire into the tube. I'm sure that it took a while to work it's way down to cause the flat (I guess). Anyway, the question I have for all you serious cyclists, is how often do you check your tires for debris or trash that may have become imbedded in the tires which could later cause flats? Do you check after the end of your riding day, periodically during the day, or whenever you think about it? Thanks.