Inner Tube Removal

• 1). Remove the cap atop the Roadmaster MT Sport SX rear wheel valve stem. Using your thumb's fingernail, depress the valve stem core and release any air remaining inside the tire.
  
  
• 2). Set the Roadmaster MT Sport SX wheel upright on the ground or workbench. Rotate the wheel so that the valve is at the bottom.
  
  
• 3). Pick up the tire lever. The tire lever has two ends, one hooked and one smooth like a spoon.
  
  
• 4). Insert the smooth end of the tire lever beneath a portion of tire bead opposite the tire valve.
  
  
• 5). Hold the Roadmaster MT Sport SX rear tire with one hand while using the other hand to rotate the tire lever along the tire bead, causing the bead to pop out of the rim. Rotate the tire lever in one direction, working down toward the valve. Next rotate the tire lever in the opposite direction, again moving toward the valve.
  
  
• 6). Reach inside the tire and grab the inner tube. Pull the inner tube away from the tire, and discard.
  
  

Inner Tube Installation

• 1). Unfold the new inner tube. Insert the valve stem through the hole in the Roadmaster MT Sport SX rim. Using your fingers, tuck the remainder of the inner tube back inside the tire.
  
  
• 2). Stand the wheel upright with the valve at the top. Place both hands over the top of the tire.
  
  
• 3). Use your thumbs to push the loose tire bead back onto the rim, beginning at the valve and working toward the bottom of the tire. Rotate the tire as needed, until each section of bead is tucked inside the rim.
  
  
• 4). Use a bicycle tire pump to inflate the tire. The recommended tire pressure can be found on the side of the Roadmaster MT Sport SX tire. Replace the cap atop the valve once inflated.