[header] How to change a bmx tire [title] Using a valve stem tool or the tip of a screwdriver let all of the air out of the tube. [title] Undo the wheel nuts or quick releases and remove the wheel. [title] Remove the dust cap (if there is one). 
[title] Put a tyre lever (not screwdriver) between the tire and the rim just far enough to hook the tire. [step] You don't want to contact the tube with the tyre iron because it may puncture the tube.