AWE Butyl Rubber Inner Tube 27 x 1 1/4 (700x28/37C) Schrader Valve ETRTO 28/37 - 622 500% 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 permability test data 1972)
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