The Schwalbe Tube No.15 is suitable for 28" (or 27" - 630) tires with a width of 18-28 mm and is used for racing bicycles. Due to their excellent manufacturing, Schwalbe tubes have proven themselves in the market for years. They have a consistent wall thickness and round profile. Their precise structure makes the seams durable. A comparative test showed that the Schwalbe tube maintains air pressure significantly longer than other tubes (the competitors lost almost twice as much air pressure in 30 days compared to the Schwalbe tube). One possible reason for this could be a lower butyl content in the other tubes. The special quality of Schwalbe tubes is a result of the uniqueness of their rubber mixture. To ensure this high quality, each individual Schwalbe tube is inflated and tested for at least 24 hours before leaving the factory. Features: - Butyl rubber ensures double the air retention - 24-hour test for each tube - High elasticity allows for coverage of many tire sizes per tube - Recycling process achieves a very good energy balance Suitable for tire sizes: 18-622 | 28 x 3/4 | 700 x 18C 18-622 | 28 x 0.75 | 700 x 18C 19-622 | 700 x 19C 19-622 | 700 x 19 20-622 | 28 x 0.75 | 700 x 20C 20-622 | 28 x 3/4 | 700 x 20C 22-622 | 28 x 0.90 | 700 x 22C 22-622 | 700 x 22 22-622 | 28 x 7/8 | 700 x 22C 23-622 | 28 x 0.90 | 700 x 23C 24-622 | 700 x 24C 24-622 | 700 x 24 25-622 | 28 x 1 1/16 26-622 | 700 x 26C 26-622 | 700 x 26 28-622 | 28 x 1 5/8 x 1 1/8 | 700 x 28C 20-630 | 27 x ¾ 22-630 | 27 x 7/8 25-630 | 27 x 1 1/16 25-630 | 27 x 1.00 Valves: - AV = Auto, Schrader - DV = Dunlop, Blitz, German valve - SV = Sclaverand, Presta, French valve (40, 50 or 60 mm for different rim heights) Included: - 1 x Schwalbe Tube No.15 including valve