Schwalbe SV12

"The Schwalbe SV12 standard inner tube is the ideal choice for all cyclists who rely on reliability and durability. This inner tube is specially designed for bicycle tires in the sizes 26" and 27.5" Inch, which makes it very versatile. Thanks to the high-quality material grade and uniform wall thickness, the SV12 retains air for an above-average length of time, making frequent re-inflation unnecessary. These properties ensure constant performance and high riding comfort, whether on daily commutes or longer bike tours"
"The quality of Schwalbe bicycle tubes has proven itself millions of times over, and the SV12 is no exception. It offers the highest reliability that you will feel on every ride. The inner tube is compatible with the ETRTO-Standard 32/47-559/597, which enables easy and precise adaptation to most common bicycle tires. Trust in a tube that impresses with its durability and resistanceu00e4u00fc."