Abstract: A head tube assembly for a bicycle has a frame, a lower tube, an upper tube and a cover. The lower tube is mounted in the front end of the frame and has a top, a bottom and a lower bearing mounted in the bottom of the lower tube. The upper tube has a top, a bottom detachably connected to the top of the lower tube and an upper bearing mounted in the top of the upper tube. The cover is detachably mounted on the top at the front end of the frame and has a through hole mounted around the top of the upper tube.

Abstract: A head tube assembly for a bicycle has a frame, a lower tube, an upper tube and a cover. The lower tube is mounted in the front end of the frame and has a top, a bottom and a lower bearing mounted in the bottom of the lower tube. The upper tube has a top, a bottom detachably connected to the top of the lower tube and an upper bearing mounted in the top of the upper tube. The cover is detachably mounted on the top at the front end of the frame and has a through hole mounted around the top of the upper tube.

Abstract: A rear fork for a rear suspension bicycle having a ground link, the rear fork has a front frame, a rear frame, input links, a shock absorber, coupler links, follower links, a brake mount and a connecting shaft. The input links are mounted pivotally on the ground link and are connected to the shock absorber that is mounted on the ground link. The coupler links are connected to the input links and terminate in dropouts being mounted thereon. The followers are mounted rotatably on the dropouts and pivotally to at least one link mount being connected to the ground link. The brake mount is pivotally mounted adjacent to a non-drive side dropout and has a caliper mounted thereon. The connecting shaft is connected to the ground link and the brake mount to prevent a shock absorbing force of the rear fork from interfering with a braking force of the caliper.

Abstract: A process for obtaining a factor XIII preparation is described, in which the factor XIII is precipitated from a placental extract using an alcohol, and is adsorbed onto an anion exchanger, and the exchanger is washed and the factor XIII is eluted. The factor XIII preparation obtained can be used for the treatment of disturbances of blood coagulation.

Abstract: A precipitation process for the preparation of blood plasma constituents is disclosed, wherein the plasma to be fractionated and the precipitant are circulated in a closed system.