AWE Butyl Rubber Inner Tube 27.5 x 1.75 - 2.25 Schrader Valve|ETRTO 47/57 584|500% Extra Ride Time*|100% Butyl rubber tube restricts air loss which increases tyre life and maximises performance.|AWE tubes have excellent air retention properties 500%+ compared to natural rubber (*Refers to Dow Corning gas permeability test data 1972)|100% Butyl rubber has increased durability and is more resistant to punctures.|Each AWE Butyl tube is inflated under pressure for 24+ hours to ensuring 100% no leaks.|AWE tubes are easy repairable using AWE Self Seal repair kits or any quality repair kit.