26", reinforced 37-559, 26 x 1 3/8 40-559, 26 x 1.50 44-559, 26 x 1.60 47-559, 26 x 1.75 37-584, 26 x 1 1/2 x 1 3/8 44-584, 26 x 1 1/2 x 1 5/8 37-590, 26 x 1 3/8 47-597, 26 x 1.75 The Tour 26 Hermetic Plus inner tube by CONTINENTAL You don't even see it on the bike, and yet every bike needs (at least) two of them: the inner tube. The sizes are on the side of most outer tires. The first two digits indicate the width of the tire and the following digits provide information about the outer tire. The Tour 26 Hermetic Plus is the right inner tube for many 26" tire widths. Important, depending on the rim height and the pump: the Schrader valve is 40 mm long. Width inch 1 1/2 x 1 3/8 , 1 1/2 x 1 5/8 , 1 3/8 , 1.50 , 1.60 , 1.75 ETRTO 37-559 , 37-584 , 37-590 , 40-559 , 44-559 , 44-584 , 47-559 , 47-597 Main color black Valve type auto (AV) Type/kind Article Valve length 40.0 mm Wheel size 26 "