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Inner tubes are an essential component of a mountain bike, providing the cushioning between the tire and the rim and maintaining tire pressure. These tubes come in different sizes and valve types, including Presta, Schrader, and Dunlop. They also come in various thicknesses, affecting the tube’s durability and puncture resistance. Popular options include lightweight tubes made of high-quality butyl rubber or latex, durable tubes with reinforced walls, and self-sealing tubes that seal punctures automatically. Additionally, tubeless options are becoming increasingly popular as they offer better puncture resistance and can run at lower pressures, improving grip and control.