Schwalbe SV 40mm Tube 5 (18") 18–20 × 1.25–1.85

Schwalbe standard bicycle inner tube no. 5. For bicylce tires in 18" inch (ETRTO 40→47-355, 32-369, 37-390, 37-400). Retains air for an above-average length of time. Thanks to the best material quality and uniform wall thickness. Maximum reliability that has proven itself millions of times over.