Abstract: The present disclosure describes an axle and hub structure for attaching a wheel to a bicycle or motorcycle, where the bearings for rotationally supporting the axle and hub are positioned on the frame, and the axle rotates relative to the frame. In one embodiment, a structure for attaching a wheel to one of a motorcycle or bicycle includes an axle having opposing end portions and supporting a wheel, at least one left axle support collar, at least one right axle support collar, a bearing in the left axle support collar and supporting one end portion of the axle, and a bearing in the right axle support collar and supporting an opposing end portion of the axle. The axle rotates relative to the frame.

Abstract: A self-adjusting bearing comprises an elongate body portion of compressible, resilient material of truncated conical shape with a central cylindrical bore formed therethrough. A plurality of independent segments of wear-resistant material are secured to the inner surface of the body portion to form a liner adapted to make bearing contact with a component received within the bore. The segments are each of arcuate transverse section, the side edges of adjacent segments being spaced from one another and the arrangement being such that, on location of the bearing in an associated, correspondingly-tapered bore whereby the body portion is radially compressed, the radial forces established within the body portion urge the segments of the liner into bearing contact with the component within the bore of the body portion.