Schwalbe SV21 650B Innenschläuche, 70 x 3,8/6,1 cm (40/62-584), Presta-Ventil, 2 Stück, Schwarz

Schwalbe -SV21 inner tubes are designed and manufactured to last for an extremely long time. Not only is each individual hose inflated and inserted into a mold to ensure uniform wall thickness and excellent air retention, they are also stored under pressure for 24 hours to test air retention. Airtightness: Schwalbe hoses keep air pressure much longer. The quality and material unit of the rubber compound directly affect the quality of the hose. Each Schwalbe hose is individually inflated and inserted into a mould. This ensures an even wall thickness and excellent air retention. Reliability: Consistent quality control brings the safety of use: each tube is inflated in the factory and stored under pressure for 24 hours to test air retention. GROUP TUBE SYSTEM The high elasticity and high quality material of our tubes allows it to cover many tire sizes. Only an extremely high-quality and reliable hose is up to this demand. Keeps pressure longer! Compared to other hoses (including named brands, own brands and without name products). The result was clear. Over a period of 30 days, the other hoses lose almost twice as much pressure than Schwalbe hoses. Possible reasons: less butyl content or lower butyl quality. Schwalbe is uncompromising in its standards, despite the steadily rising world market prices of butyl.