Patent ID: 8474587

Claim:
A bicycle hub assembly comprising: a hub having a driving tube connected to one of two ends of the hub and the driving tube being a hollow tube, a ratchet portion and a sprocket portion respectively defined on an outer periphery of the driving tube, a first recess and a second recess defined in an inner periphery of the driving tube, the first recess located corresponding to the ratchet portion and the second recess located corresponding to the sprocket portion; a ratchet unit mounted to the ratchet portion and rotated with the driving tube; a sprocket unit mounted to the sprocket portion and rotated with the driving tube, a rotary unit including a first rotary member and a second rotary member, each of the first and second rotary members having an outer portion rotatable relative to an inner portion thereof, the first rotary member engaged with the first recess and the second rotary member engaged with the second recess; an axle extending through the hub and the second rotary member, a positioning unit being located between the hub and the axle, the positioning unit extending through the first rotary member; and a positioning flange extending from an inner periphery of the hub, the positioning unit including a first positioning part and a second positioning part, the first positioning part being inserted into a first end of the hub and including an end flange which contacts the positioning flange, the second positioning part including an insertion end and a connection end, the insertion end being inserted into a second end of the hub and threadedly connected with the first positioning part, the connection end being engaged with the inner periphery of the first rotary part.