Abstract: A hydraulic brake arrangement for a bicycle with a transmitting unit with a brake lever, and a cylinder housing with a cylinder space, and with a piston unit displaceably received in the cylinder space. The brake lever is operatively coupled with the piston unit by means of an actuating mechanism. The cylinder housing comprises a lever-side end and a receiver-side end. On the receiver-side end, a connection port is configured for coupling a conduction device. On the lever-side end, a connecting opening is configured, through which the actuating mechanism extends into the cylinder space to the piston unit. The connecting opening is configured in a supporting wall extending transverse to the longitudinal axis of the cylinder space and non-detachably connected with the cylinder housing. The piston unit is inserted into the cylinder space through the connection port.

Abstract: A wheel component with a fixing ring for attaching a brake disk to a hub shell of a bicycle hub, and with a securing unit for securing the fixing ring, wherein the ring includes a radially-extending fixing unit, and a threaded axially-extending tube unit, to screw the thread of the threaded tube unit on the hub shell, and to attach the brake disk to a hub. The fixing unit includes at least one axial through hole which is configured such that the through hole is at least in partial axial alignment with an axial cavity in the brake disk in the mounted state of the fixing ring, so that the securing arm of the securing unit is insertable into the cavity of the brake disk through the through hole in the fixing unit, so that the securing arm locks the fixing ring to prevent inadvertent detachment of the fixing ring.