The fastening assembly (1) has a fixing device (20) that is detachably coupled to a connecting structure. A clamping closure structure has a cam that is pivotally connected to one end of fastening device. The holding device (40) and connection structure are arranged in a cavity of a bicycle steered tube. The clamping closure structure is movable between locking position at which detachment of fastening device from connecting structure is prevented, and release position at which removal of fastening device from connecting structure is facilitated.
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