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Schwalbe Aerothan Tube - 27.5 x 2.1 - 2.4 40mm Presta Valve MFPN=MAG-CONV-KIT }Wolf Tooth Elliptical 104 BCDSchwalbe Aerothan Tube 27. 5 x 2. 1 2. 4 40mm Presta Valve. Developed in cooperation with BASF and with experts from the German plastic manufacturing industry the Aerothan tube emerged to not only meet all the requirements of a high end bicycle tube but to exceed them. Fully light weight right to the valve about 40% less weight than a comparable Schwalbe extra light tube Puncture protection newly defined the material itself prevents sudden air loss