18" BIKE INNER TUBE COMPATIBILITY – Designed to fit 18x1.50, 18x1.75, 18x1.90, 18x2.0, and 18x2.125 (47/57-355) tire sizes. Equipped with a durable 32 mm Schrader (AV32) valve, this butyl rubber replacement tube offers excellent flexibility and stretch—ideal for kids’, BMX, cruiser, and mountain bikes. STRONG AIR-TIGHT BUILD – Crafted from high-elasticity, mould-cured butyl rubber that seals air effectively and resists pressure loss. The reinforced 32 mm Schrader AV valve with rubber base ensures a secure seal and smooth inflation. Thick walls keep pressure steady, reduce refills, and deliver a safe, stable ride on any terrain. DURABLE & PUNCTURE-RESISTANT DESIGN – The thick butyl rubber structure withstands friction, heat, and road wear far better than standard tubes. Built to handle bumps, rough terrain, and daily rides, it extends tube lifespan and reduces replacement frequency. COMPLETE 18in BIKE TUBE KIT – Compatible with kids’, BMX, cruiser, mountain, and electric bikes. Each set includes two premium butyl rubber inner tubes and two tire levers for quick, easy replacement. The user-friendly design fits 18x1.75–2.125 tires perfectly for fast installation. 100% SATISFACTION GUARANTEE – If you have any concerns, contact us through Yaxa’s messaging centre and we’ll do whatever it takes to make sure your experience meets or exceeds expectations.