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Lightweight, especially for 27.5 inch MTB wheels developed Schwalbe tube with french valve (Presta). Proven for many year Schwalbe Extralight tubes offer the same reliability as normal tubes but simultaneously a lower weight. Extreme air pressure stable! The rubber compound makes it possible: less air leakage and less to pump. Extremely reliable! Quality control for safe riding pleasure: each Schwalbe tube is checked twice on air retention in the factory.