Replacement bicycle inner tubes 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. Fenix Branded Tube, 26 x 1.90-2.125 32mm SCHRADER Valve. Replacement bicycle bike inner tube for mountain, cruiser or any bicycle tire with the same tire dimensions. Be sure to verify the valve type and length also.