how to change a flat tire

Here are the steps to change a bicycle inner tube:

1. Remove the wheel from the bike. 
2. Using bike tire levers, pry one side of the tire off the rim. This breaks the bead seal between the rim and tire. Work the tire levers around the rim, prying the whole tire off.
3. Inflate the new replacement inner tube just enough to barely give it some shape. 
4. Insert the new tube inside the tire, being careful not to twist it. Use your hands to coax the whole tube evenly into the tire casing all the way around.  If the tire is damaged internally a dollar bill or tire liner needs to be placed between the tube and tire or it will pop the tube.
5. Press one side of the tire onto the rim edge. Working your way around both sides, fit the tire back onto the wheel rim using your hands only.
6. Re-inflate the tube enough so that the tire takes proper shape again. Make sure the tube is seated evenly under the tire. Inflate to your desired pressure.  It is critical to make sure the tire beads set evenly all around the rim.
7.  Inflate to your desired pressure.  
8. Reinstall wheel.
9. Always check shifting and brakes are working properly before riding.