18" Bike / Cycle Inner Tube - 18" x 1.75 to 2.125 (Fits all sizes 18" x 1.75, 1.85, 1.90, 1.95, 2.0, 2.1, 2.125) - Universal Schrader/Auto Valve - FREE SHIPPING! FREE VALVE CAP UPGRADE WORTH $4.99! SUPER AIR TIGHT: Less requirement to re-inflate unlike other tubes. PUNCTURE RESISTANCE: Higher quality butyl rubber gives better protection. METAL VALVE CAP: 3x Higher air retention over plastic caps. One cap per tube.