Tube, 12"-1/2 x 2-1/4" Straight Schrader or 70 Degree Angled Schrader Valve, 32mm Length Valve. Kids, Child or Youth Bike. Any bike with same tire dimensions. Tubes, 12"-1/2 x 2-1/4" - Select 70 Degree Angled or Straight Valve - See Pictures Straight or 70 Degree Angled Schrader Valve - See Pictures 32mm Schrader Valve Kids, Youth, Stroller or childs bicycle with the same tire dimensions Be sure the tire bead is seated evenly all around the rim by first adding a little air to the tire, checking the bead on both sides and if beaded properly continue filling air to the correct pressure as stated on the tire. For the health of your tire and tube always maintain the proper air pressure. See the side of your tire for minimum and maximum pressures. This inner tube can handle any air pressure that is designated on your bicycle tire.