Keep your bike rolling smoothly with the Schwinn 12", 16", 18", 20", 24", 26", 27", 27.5", 29", 700c Replacement Bike Tire Tube. Designed for durability, this tough rubber tube offers long-lasting use and puncture resistance, with an inner sealant that instantly seals small punctures for a self-sealing ride on the self-sealing tubes. The standard Schrader valve stem ensures easy inflation, while its reliable construction makes it perfect for a variety of bicycle tires. Easy to install, this tube is a must-have for quick repairs – so pack a spare and ride with confidence. Installation is easy with a bike pump, tire lever, and the simple instruction guide. Comes with a one year limited warranty. At Schwinn, we're empowering millions to enjoy the joy and freedom of riding.