20" BMX Bike / Cycle Inner Tube - 20" x 1.75 to 2.125 (Fits all BMX sizes 20" 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 CAPS - 3x Higher air retention over plastic caps IN STOCK - Ready to ship now .