Abstract: A bicycle seat includes an upright post, a support base mounted on an upper end of the upright post, a rotation base rotatably mounted on the support base, a seat body movably mounted on the rotation base, a retaining member mounted on the seat body, and two locking bolts in turn extending through the support base, the seat body and the retaining member to clamp the seat body between the rotation base and the retaining member. Thus, after each of the two locking bolts is unscrewed, the seat body is movable forward and backward relative to the upright post so as to adjust the position of the seat, and is rotatable relative to the upright post so as to adjust the inclined angle of the seat.

Abstract: A bicycle frame includes a mandrel, a hub and freewheel assembly, two bearings, two first locking nuts, two fork end members, and two second locking nuts. Thus, when each of the first locking nuts is screwed onto the respective first threaded section of the mandrel and when each of the second locking nuts is screwed onto the respective second threaded section of the mandrel and rested on the respective fork end member, the respective fork end member will not be driven by the respective second locking nut to push the respective first locking nut to prevent the respective bearing from being compressed by the respective first locking nut so as to maintain the normal operation of the respective bearing.

Abstract: A hub for a bicycle includes a shaft, a hub body rotatably mounted on the shaft, a drive seat rotatably mounted on the shaft and engaged with the hub body, and a self-lubricating bearing mounted between the drive seat and the shaft. Thus, the self-lubricating bearing has an inner wall contacting with an outer wall of the shaft completely and an outer wall contacting with an inner wall of the drive seat completely, so that the external force applied on the self-lubricating bearing is distributed evenly and smoothly to prevent the self-lubricating bearing from being distorted or deformed due to a stress concentration, thereby enhancing the lifetime of the self-lubricating bearing.

Abstract: A rear hub for a bicycle includes a shaft, a hub body mounted on the shaft, two races each mounted between the shaft and the hub body, two tapered bearings each mounted between the shaft and a respective race, a protruding pull block mounted on a first end of the shaft and rested on a first tapered bearing, and a locking nut secured on a second end of the shaft and rested on a second tapered bearing. Thus, the user only needs to screw the locking nut onto the shaft to pull the pull block to clamp the tapered bearings and the respective races, so that the rear hub is assembled easily, quickly and conveniently.

Abstract: A hub assembly for a bicycle includes a hub body provided with a mounting portion, a freewheel slidably mounted on the mounting portion of the hub body, and at least one retainer mounted on the mounting portion of the hub body and rested on the freewheel to retain the freewheel on the mounting portion of the hub body to prevent the freewheel from being detached from the mounting portion of the hub body. Thus, the freewheel is slidable on the mounting portion of the hub body to change the position of the freewheel relative to the chainwheel, so that the freewheel is in line with the chainwheel, and the chain is perpendicular to the hub body constantly without incurring deflection.

Abstract: A bicycle dual-brake system is mounted on a front fork and a front wheel hub of a bicycle. The system comprises two units, with one unit being fastened with one front-fork tube and one end of the front wheel hub, with other unit being fastened with other front-fork tube and other end of the front wheel hub. Both units are connected to the same brake lever mounted on a handlebar of the bicycle. Both units are formed of a disc fastened with the front wheel hub, a brake device fastened with the front fork, and a brake cable connecting the brake device to the brake lever.

Abstract: A bathtub comprising a bathtub body having two rows of spaced join posts at two lengthwise opposite edges of the bottom reinforced with crossing ribs, locating feet standing on the floor of a bathroom and fitting with the join posts of the bathtub body for supporting the bathtub body, a protective plate fixed vertically beside the lengthwise side of the bathtub body and having fixing posts fitting with locking tubes with which sidewise posts provided on the locating feet also fits so that the bathtub body may be positioned firmly, with hollow space under it being for easy affix of a drain tube with thee bathtub body.