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This is something you will need to know how to do if you have a bike in case you get a flat.

. First you will make sure all the air is out, and take the tire off the rim and take the tube out.

. Next you will check the cause of the flat tire, check the tube, get rid of the damaged tube, get a new tube, and put it in.

. Next, you will make sure you put some baby powder on it before you put it on, and then lay the tube in the rim.

. Last, you will push the tube between the tire and the rim and press the tire over the rim.