The Zipp Tangente butyl tubes are designed to meet the needs of a new era of road riding that includes adventures aboard wider tires. The tube's 0.60mm thickness is optimized for durability.Weight: 72g37mm valve stem lengthLightweight aluminum valve body with removable Presta valve coreFor use with Zipp Tangente Aluminum Knurled Valve Extender0.60mm thick to optimize durabilityWhen installing Zipp Tangente tubes (37mm valve stem) on Zipp wheels, the following valve extender is recommended: PU9911, 27mm (1 gram) for 303 model wheels PU9912, 41mm (2 g.) for 404 models PU9913, 65mm (4 g.) for 808 models PU9914, 91mm (6 g.) for 1080 modelsItem SpecificationsISO Diameter622 / Road / 29"ISO Width (mm)20ISO Width (mm)21ISO Width (mm)22ISO Width (mm)23ISO Width (mm)24ISO Width (mm)25ISO Width (mm)26ISO Width (mm)27Labeled Size700 x 20 - 28Shaft TypeSmoothTube CompoundButylValve CoreRemovableValvePresta Short 32-40mmWeight90 Zipp Tangente Tube Tubes UPC: 710845778544