24" 32-507, 24 x 1 1/4 32-541, 24 x 1 1/4 x 1 3/8 40-534, 24 x 1 1/2 40-507, 24 x 1.50 47-507, 24 x 1.75 47-544, 24 x 1.75 x 2 The Compact 24" from CONTINENTAL If you don't want to spend a long time patching an inner tube during a tour, take a spare tube with you. The ETRTO size on the side of the tire provides information about the correct inner tube. The first two digits before the hyphen indicate the width of the tire in mm, the digits after the hyphen indicate the outer diameter of the tire, which is 24" for the Compact 24". The length of the Schrader valve is 40 mm. Width inch 1 1/2, 1 1/4, 1 1/4 x 1 3/8, 1.50, 1.75, 1.75 x 2 ETRTO 32-507, 32-541, 40-507, 40-534, 47-507, 47-544 Main color black Valve type auto (AV) Type/kind of Article Valve length 40.0 mm Wheel size 24"