Schwalbe Tube Item 7B - 20" (23/25-451) - 85g

The Schwalbe Tube No. 7B is a specialized, lightweight inner tube designed for high-performance 20-inch wheels, specifically those with the 451mm ETRTO diameter (often found on racing BMX, recumbents, and high-end folding bikes)

Unlike standard 20-inch tubes, the 7B is tailored for narrower tires, providing a precise fit that reduces the risk of pinching or bunching. Manufactured with Schwalbe’s premium butyl compound and uniform wall thickness, it offers exceptional air retention and reliability in a compact 85-gram package.