- Product Specification: 20''x4.0''/4.5" TR4A-40L (102/114-406) Heavy Duty Bicycle Replacement Inner Tube. Compatible with 20x3.5, 20x4.0 E-Bike and bicycle tires. - Enhanced Durability: Constructed from high elasticity butyl rubber and EPDM rubber, this inner tube is 40% thicker than standard tubes, offering 200% greater air tightness. It maintains optimal air pressure for 6-9 months post-inflation, significantly reducing the need for frequent inflation. - Superior Puncture Resistance: The robust design offers higher puncture resistance compared to standard inner tubes, allowing it to withstand increased friction and wear. This extends the product's lifespan, minimizing replacement frequency and maintenance costs over time. - Exceptional Shock Absorption: The heavy-duty butyl rubber material provides excellent shock absorption, effectively reducing vibrations and impacts from rough terrain, enhancing overall ride comfort. - Easy Installation: Designed for straightforward installation and removal, the inner tube features a user-friendly valve position for correct installation direction. - Versatile Applications: Ideal for a variety of uses, including: - E-bikes navigating urban environments with potholes and uneven surfaces. - Off-road bicycles tackling rugged trails. - Commuter bikes requiring reliable performance for daily use. - Key Benefits: - Increased durability and longevity reduce overall maintenance costs. - Enhanced air retention for stable tire pressure improves safety and performance. - Superior shock absorption for a smoother, more comfortable ride.