Suitable dimensions 47-305 16 x 1.75 50-305 16 x 2.00 54-305 16 x 2.10 57-305 16 x 2.125 62-305 16 x 2.50 Weight 115 g 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 tubes are inflated and stored for 24 hours to test for air retention. Afterwards, every tube is carefully checked individually by visual inspection. The special quality control which prevents unpleasant surprises. The Schwalbe tube has been valued by German bicycle dealers for its high reliability for many years. Only an extremely high-quality and reliable tube is equal to these demands. 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.