This document provides step-by-step instructions for changing a flat tire on a bicycle. The 6 steps are: 1) Detach the wheel from the bike frame; 2) Remove the tire from the wheel; 3) Inspect the tire for debris or punctures; 4) Install a new tube inside the tire; 5) Reattach the tire to the wheel rim; 6) Reattach the wheel to the bike frame and inflate the new tube. Changing a flat requires removing the wheel, replacing the punctured tube, remounting the tire and wheel, and is a basic maintenance task for bicyclists.