In this tutorial, we learn how to change a flat BMX tire. First, take the wheel off with a wrench. Then, let all the air out of the tire if it's not already completely out. Next, find what gave you the flat tire and make sure you remove it from the tire. After this, grab the top of the tire and pull it off of the wheel. If it's completely flat, it should be easy to take off from the rim. Work your way around until it's completely off. Then, put the new tire on and then pump it with air. After this, you can put the wheel back on your bike and continue to ride.