Michelin TubesPre-loaded with sealant to resist punctures and nipping impactsSquare shape prevents twisting during installationExcellent air pressure retention; holds air twice as long as Airstop modelsItem SpecificationsWeight344gValveSchraderISO Diameter559 / 26" mtnISO Width48,49,50,51,52,53,47,54mmLabeled Size26 x 1.85-2.3"Valve LengthShort 32-40mmTube CompoundButylValve ShaftSmooth