- Product: 20"x4.0" Heavy Duty Bicycle Inner Tube (Model: TR4A-40L, Part No. 102114-406) - Compatibility: Designed for E-Bike and bicycle tires sized 20"x3.5" and 20"x4.0", ensuring versatility for various applications. - Heavy Duty Construction: Made from high elasticity butyl rubber and EPDM rubber, this inner tube features a 40% thicker body compared to standard options. This enhances air tightness by 200%, allowing for stable tire pressure for 6-9 months after inflation, reducing the frequency of refills. - Puncture Resistance: The robust design provides superior puncture resistance and durability, effectively withstanding friction and wear. This results in a longer lifespan, minimizing the need for replacements and lowering maintenance costs. - Shock Absorption: Crafted with durable butyl rubber, this inner tube absorbs shocks, providing a smoother ride over bumps and rough surfaces. Experience enhanced comfort on any journey. - Easy Installation: The tube is designed for straightforward installation and removal. Ensure correct valve positioning for proper setup. - Practical Applications: Ideal for urban commuting, recreational rides, or off-road adventures. This inner tube is built to handle heavy loads, making it suitable for various riding conditions. Upgrade your riding experience with our heavy-duty inner tube, engineered for performance and reliability.