Schwalbe Tube SV 15 700x18-28 Presta Valve 40mm Bike Tube - Value Bundle 3-in-1 Packs Bicycle Tube 700c Wheel Size: 700x18/28 (622), Valve: Presta (40mm), Claimed Weight: 105g All purpose inner tube and excellent replacement inner tube for your road bike Besides the quality of the ingredients, the purity of the rubber compound is decisive for the quality of the tube. Before extrusion, the basic material is forced through a total of seven filters under enormous pressure. All tubes are inserted and inflated into a mold for the vulcanization process. Only this ensures an even wall thickness and high air retention. All valves are nickel-plated and threaded. The valve core is always replaceable. Also, Schwalbe tubes with a classic bicycle valve can be inspected for pressure as they have a high-pressure valve core. As an external indicator, every tube has a stylish dust cap made out of transparent polycarbonate. The Schwalbe tube is the only tube which carries the VSF all ride quality stamp. VSF is an association of particularly dedicated and quality-oriented German bicycle dealers.