Einleitung
This guide puts the bike on a stand to replace its tube. However, you can turn the bike upside down and follow the same steps if you do not have a stand.
Werkzeuge
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Unfasten the left side of the wheel by pulling the black "L" shaped lever up with your hands.
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On the right side, use your hands to unscrew the cap of the axle counterclockwise until it is loose.
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Slightly loosen the valve bolt counterclockwise with your thumb and index finger.
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Deflate the tire by pressing down the air valve tip with your finger. Use as much pressure as needed to hear the air flowing out of the tube.
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Hold the tire lever firmly in your hands and look for the boundary between the tire and the wheel rim. Apply great force to the lever until you pry the rim and the tire apart.
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With the tip of the lever inserted between the rim and the tire, rotate the lever 90° counterclockwise and fix the lever to the metal spokes using the arrow shaped slot located on the top of the lever.
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Insert an extra tire lever between the tire and the rim.
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Move the lever along the circumference of the rim to pry the tire apart.
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Start removing the tire by unplugging the valve from the rim slot.
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Remove the rest of the tire and the tube from the rim.
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Insert the new tube inside the tire.
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Place the tire back on the rim by inserting the valve into its slot first.
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Use your thumb to press the tire's side until its entire circumference is placed inside the rim.
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