- Product Overview: Heavy duty bicycle replacement inner tube, size 20"x4.0"/4.5" (AV32mm, 102/114-406). Compatible with tire sizes 20x4.0, 20x4 1/4, 20x4.25, and 20x4.5, making it suitable for a broad range of applications. - Self-Sealing Feature: The self-sealing inner tube repairs small holes and fine cracks automatically. Ideal for everyday use, it can handle slow leaks that may occur over time or from punctures, such as from nails. Works effectively in temperatures down to -15°C, making it perfect for cold-weather biking. - Enhanced Safety: Pre-installed with sealant for superior puncture protection. This thicker inner tube design is more durable than standard options. The puncture repair liquid activates to fill leaks within 5 to 8 seconds under normal conditions. - Superior Shock Absorption: Crafted from heavy-duty butyl rubber, these inner tubes absorb vibration and provide a smoother ride over rough terrain. The robust material enhances overall ride comfort, allowing you to enjoy your biking experience. - Longer Lifespan: Designed with higher puncture resistance, these tubes endure more friction and wear. This durability extends the life of the tube, minimizing replacement frequency and lowering maintenance costs over time. - Optimum Air Tightness: Constructed from high-elasticity butyl and EPDM rubber, the tube’s thickness is increased by 40%, enhancing air tightness by 200% compared to standard butyl tubes. Maintains higher pressure for 6 to 9 months after inflation, significantly reducing the need for frequent reinflation. - Practical Applications: Ideal for urban commuting, recreational cycling, or off-road biking. Whether navigating city streets, tackling rugged trails, or enjoying leisurely rides, this inner tube provides the reliability and performance needed for a smooth journey.