This video from Canada Bicycle Parts shows how to change a bike tire. The tools required are a bicycle pump and tire levers. He demonstrates with the rear tire, and puts the chain on the proper cog to create less tension on the chain. He releases a lever on the brake and opens the quick release lever and lowers the rear wheel. He removes the valve cap and removes all the air from the tube. He demonstrates how to remove the tire with two tire levers. He explains how to determine what caused the flat tire, and which type of replacement tube to use. He then demonstrates reinstalling the wheel. This video shows every step in the process of changing a bike tire so you can do-it-yourself.
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