Its front and rear tube shaft four in one structure, elbow wheel hub. Equipped with NBK Bearing, equipped with black freehub, compatible with For SHIMANO HG 8-12 speed and SRAM NX 12S ，SX 12S. [Structure]: NBK bearing; AL7075 T6 aluminum alloy shaft, AL6061 body; P.C.D 58MM, 4 pawls;.
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