How to Change a Tire Tube on a Mountain Bike: A Step-by-Step Guide
First, remove the wheel from the bike. Then use a tire lever to pry off one side of the tire from the rim. Remove the old tube and check for punctures or damage. Insert the new tube into the tire, making sure it is positioned correctly. Inflate the tube slightly and reposition the tire onto the rim, starting on the opposite side to where you removed it. Use the tire lever to finish pushing the tire back onto the rim. Inflate the tire to the recommended pressure, and reattach the wheel to the bike.