Abstract: A bicycle crank axle comprises two fitting shafts located respectively at both ends thereof. One of two fitting shafts is provided with a stopping block while another one of the two fitting shafts is provided with a threaded portion. Two fitting shafts are fitted respectively into a tapered sleeve engageable with a tapered bearing which is fastened with a tapered fixation seat. The threaded portion of the crank axle is engageable with a fastening nut by which the crank axle can be fixed with ease and precision.

Abstract: A bottom bracket for a bicycle includes an axle extending through a tube which has a first end with a first hole defined therein and a second end having a plurality of hook elements extending therefrom for engagement with a second cap at an engaging shoulder defined in the second cap, the first hole of the tube has a tapered inner periphery for engagement with a first flange having an outer tapered periphery of the axle, a first bearing is disposed between the first cap and the first end of the tube and a second bearing is disposed between the second cap and the second end of the tube, a housing threadedly engaged to an outer threaded periphery of the first and the second caps respectively such that the axle is securely engaged between the first cap, the tube and the second cap by the engagement of the hook elements and the engaging shoulder and the engagement of the first flange and the first hole of the tube.

Abstract: The steering bearing assembly includes a bearing assembly with an upper race that has a circular inner periphery and a tubular protrusion that extends axially from the inner periphery. The tubular protrusion is provided with a plurality of axial splits and an externally threaded wall which tapers gradually toward a free end thereof. A positioning seat with an internally threaded wall that complements the external wall of the tubular protrusion is mounted around the latter and above the upper race in such a manner that the free end of the tubular protrusion extends beyond the uppermost portion of the positioning seat. The tubular protrusion retracts radially and inwardly upon tightening of the positioning seat.

Abstract: A steering bearing assembly includes a head tube, a steerer tube that has a first end which is connected to a front fork of a bicycle and which extends through the head tube, and a bearing assembly disposed between the head tube and the steerer tube. A truncated cone-shaped inserter is disposed in a second end of the steerer tube and has an axially extending threaded bore formed therethrough. A C-shaped resilient member with an inner tapered wall is press-fitted into the steerer tube above the inserter. A threaded bolt is disposed on the second end of the steerer tube and is threaded into the inserter. When the threaded bolt is tightened, the resilient member expands radially to abut frictionally against the steerer tube and to compress downward simultaneously a stem that is disposed on the head tube around the steerer tube.