Many dirt riders groan at the thought of an afternoon burned changing a flat tire in the garage. But at least that misery is consigned to an area with shade, tools and refreshment easily at hand. What do you do when you get a flat on the trail or at the track? Do you let it ruin your ride? Or do you throw that bad boy in the dirt, wrestle in a new tube and fix that tire and your day of riding? You fix it and ride, duh! Fortunately (for you), Karel has more experience changing tires than most riders, with some 25-tire days, but Jimmy makes him look like a novice. On an off-road test one rider had a flat, and we had a pro photographer to document the process. Then we sacrificed an old wheel, and cut it in half to better illustrate what's happening when you change a tire.