The Super Tube is 50 percent thicker than regular butyl tubes for staunch flat protection. Great for DH and urban riding.Double-thickness butyl with a super spongy formula redues pinch flatsItem SpecificationsWeight360gValvePrestaISO Diameter559 / 26" mtnISO Width54,55,56,57,58,59mmLabeled Size26 x 2.1-2.5"Valve LengthShort 32-40mmTube CompoundButylValve CoreFixedValve ShaftThreaded Panaracer DH Tube Tubes UPC: 705160100163