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. 18-622 - 28 x 3/4 - 700 x 18C 20-622 - 28 x 3/4 - 700 x 20C 22-622 - 28 x 7/8 - 700 x 22C 23-622 - 28 x 7/8 - 700 x 23C 25-622 - 28 x 1.00 - 700 x 25C 22-630 - 27 x 7/8 25-630 - 27 x 1.00