Not long after cycling into Eastern Belgium from Western Germany, I got my first flat tire of the trip. I had my headphones in and my music blaring, yet through all that noise I was still able to recognize the sudden hiss of escaping air that comes with a massive puncture. I had run over a giant piece of green glass. No big deal, however. I simply removed the piece of glass from the tire, pulled the wheel off the front of the bike, inserted a small patch, placed a new tube inside the tire, blew the tube up, and off I went.