Schwalbe 700c Inner Tubes retain air pressure considerably longer than others. Each Schwalbe tube is individually inflated and inserted into a mold. This ensures the even wall thickness and excellent air retention. Schwalbe 700c Inner Tube Features The quality and the material purity of the rubber mixture directly effects the quality of the tube. Consistent quality control brings with it the security of use Each tube is inflated at the factory and stored under pressure for 24 hours in order to test the air retention Group Tube System.  Available Size Options 700 x 18-28c Schrader Valve 700 x 28-45c Schrader Valve 700 x 18-28c Presta Valve 700 x 28-32c Presta Valve 700 x 28-45c Presta Valve 700 x 18-25c 50mm Presta Valve 700 x 18-28c 60mm Presta Valve 700 x 28-45c 50mm Presta Valve 700 x 28-47c 60mm Presta Valve