1. PRODUCT SPECIFICATION: The tube is suitable for most mountain bikes and is the most widely used size currently on the market, compatible with 26 inches x 1.75 to 2.125 tires. The inflation valve is a 32mm standard Schrader valve. 2. REINFORCED VALVE DESIGN: Prior to production, we analyzed common causes of tube failure. In cases of leaks and tears, 70% occurred at the interface between the valve stem and the tube. To address this, we reinforced the area with a thickened design, resulting in a tear-resistant, reinforced valve construction. 3. THICKER RUBBER: The conventional tube sidewall thickness ranges from 0.75 to 0.98mm. Our tube features a 1.12mm sidewall, which is thicker than standard, providing increased puncture resistance and improved air retention. The added rubber thickness also helps absorb shocks, reducing road vibrations and enhancing ride comfort. 4. MORE DURABLE: Each tube undergoes strict quality inspection to ensure durability. Designed to support riders up to 190 pounds, the tube can last over 5,000 miles under normal riding conditions. 5. These tubes are designed for easy replacement. Given the simplicity of installation, replacing a tube is often more convenient than repairing it. Material: Rubber Color: Black Package Contents: 2 x Bike tube 2 x Tire levers Note: The package includes only the items listed above. Light reflection and display differences may cause slight variations in color between the image and the actual product. Measurement error allowance is +/- 1-3cm.