The Schwalbe Tube No.6 fits 20" tires with a width of 28-40 mm and is used in children's bikes, strollers, unicycles, trailers, and more. Due to their excellent manufacturing, Schwalbe tubes have proven themselves in the market for years. They have a consistent wall thickness and a uniform shape. Their precise bonding makes them durable at the seams. A comparative test showed that the Schwalbe tube maintains air pressure significantly longer than other tubes (the others lost almost twice as much air pressure in 30 days compared to the Schwalbe tube). A possible reason for this could be a lower butyl content in the other tubes. The special quality of Schwalbe tubes arises from the uniqueness of their rubber compound. To ensure this high quality, each individual Schwalbe tube is inflated and tested for at least 24 hours before it leaves the factory. Features: - Butyl rubber ensures twice the air retention - 24-hour test for each tube - High elasticity allows coverage of many tire sizes per tube - Recycling process achieves a very good energy balance Compatible with the following tire sizes: 28-406 | 20 x 1.10 28-406 | 20 x 1 1/8 32-406 | 20 x 1.25 32-406 | 20 x 1 1/4 35-406 | 20 x 1.35 37-406 | 20 x 1 3/8 37-406 | 20 x 1.40 40-406 | 20 x 1.50 Valves: - AV = Auto, Schrader - DV = Dunlop, Blitz, German valve - SV = Sclaverand, Presta, French valve (40 mm) Delivery includes: - 1 x Schwalbe Tube No.6 including valve