Abstract: A bicycle hub shell has an axial bore with a first end portion, a second end portion and an internal wall which confines the axial bore into a first section adjacent to the first end portion and a second section adjacent to the second end portion and narrower than the first section. A first bearing-receiver is disposed in the first end portion of the hub shell and has an enlarged head to receive a bearing therein and an internally threaded connecting tube which extends into the first section. A cylinder drive has a head portion disposed partially in the second end portion of the axial bore, an externally threaded end portion which is spaced axially from the head portion, and a plurality of ratchet pawls exposed exteriorly from the second end portion of the axial bore. The head portion of the cylinder drive further has an externally threaded and axially extending tube extension projecting into the first section of the axial bore and engaging the connecting tube of the first bearing-receiver.

Abstract: A bicycle hub assembly includes a hollow hub body having two enlarged end portions and two bearing assemblies mounted respectively in the enlarged end portions. Each bearing assembly has an inner ring, an outer ring and bearing elements confined between the inner and outer rings. The outer ring is in tight contact with the hub body. An elongated shaft passes rotatably through the hub body and is fixed to the inner rings. The elongated shaft has two ends extending outwardly of the hub body. A hub cover is sleeved around the elongated shaft adjacent to each enlarged end portion. The hub cover includes an inner annular member sleeved around the elongated shaft adjacent to one bearing assembly and an outer annular member sleeved around the inner annular member. The outer annular member has an inner end facing one enlarged end portion and an outer end opposite to the inner end.