Extremely air-tight! Less air loss means having to inflate less. A unique rubber mixture makes it possible. Extremely reliable! Each SCHWALBE tube is individually examined twice at the factory to ensue air-tightness. Special quality control that prevents unpleasant surprises. 54-584 26 x 1 1/2 x 2 220 g 40-622 28 x 1.50 700 x 38C 42-622 28 x 1.60 700 x 40C 47-622 28 x 1.75 700 x 45C 50-622 28 x 2.00 60-622 28 x 2.35 Â 28 x 1 1/2 700 x 38B