Abstract: A protection structure for outer shell of a hub comprises: a hub and an outer shell mounted at one end of the hub, the outer shell is provided at one end close to the hub with an enlarged flange, on an outer peripheral surface of the outer shell are annularly and spaced-apart formed a plurality of splines and at least one positioning rib, at least at one side of each splines is disposed with a protecting member whose material is different from that of the outer shell. By such arrangements, the protecting member can be assembled with a sprocket to prevent the sprocket from touching the splines. Thus, damages of the outer shell of the hub are prevented.

Abstract: A quick release device includes a tightening bar having an enlarged head and an actuated end outboard of two fork blades of a bicycle, and a cam member having front and rear ends, and a cam segment interposed therebetween and engaging a cam follower surface of the actuated end such that rotation of the cam segment results in movement of the actuated end between tightening and loosening positions relative to one of the fork blades. A cover includes front and rear walls which defines an accommodation space therebetween for receiving the actuated end and the cam segment. The front and rear ends extend outwardly of the front and rear walls, respectively. A lever includes front and rear lug portions which are coupled respectively with the front and rear ends of the cam member to enable the cam segment to be rotated by a turning movement of the lever.