Abstract: A bicycle stem assembly comprising a bicycle stem having a novel ways for securing it to an unthreaded bicycle fork steerer tube, the novel means featuring a castellated bushing for pre-loading the upper bearing for the steerer tube and a clamp carried by the stem for selectively locking the stem and bushing to the steerer tube.

Abstract: A handlebar adapted to be fitted onto the handles of a wheelchair having two substantially parallel handles, together with an improved push-button mechanism for locking the handlebar securely into position. The handlebar is designed with multiple ergonomically correct gripping stations which reduce strain on the hands, wrists and forearms of a person using the handlebar. Methods of retrofitting existing wheelchairs, as well as tools used in performing the retrofitting operation, are also provided.

Abstract: A handlebar for a motorcycle or similar vehicle comprises at least one outer tubular sleeve surrounding an inner tubular member which is of constant diameter and constant wall thickness throughout. Both the outer sleeve and the inner member have a central region, flanked by symmetrical oblique regions, leading to respective handgrip regions. The multi-layer construction of the handlebar limits crack propagation and allows use of two or more different materials. With a two-layer construction, the outer tubular sleeve is preferably of constant wall thickness in its central region and of constant, yet smaller wall thickness in the handgrip regions, with a reduction in wall thickness taking place over a very short distance in the intermediate oblique regions. With a three-layer construction, the outer layers may each be of constant wall thickness, the outermost layer(s) not extending to the ends of the adjacent inner layer.

Abstract: A device for making micro adjusting a steering bearing of a head bowl of a bicycle head tube includes an inner ring of the steering bearing, a pressing ring and a clamping ring, which are mounted sequentially together in an upper end of the bicycle head tube. An upper end of the clamping ring is fastened with a handlebar upright tube of the bicycle, wherein the clamping ring provides a pair of lugs, each lug having a threaded hole for engaging with a fastening means, the clamping ring is provided with an inner circumferential tapered surface. The inner ring of the steering bearing is provided with an inner circumferential tapered surface. The pressing ring is provided with an upper outer circumferential tapered surface and a lower outer circumferential tapered surface. The upper outer circumferential tapered surface of the pressing ring is engaged with the inner circumferential surface of the clamping ring.