| 摘要 |
PROBLEM TO BE SOLVED: To provide a hub with a multistage free wheel capable of avoiding the breakage of a bearing portion and the bending deformation of a hub shaft even if the number of sprockets for the multistage free wheel is increased. SOLUTION: A hub includes a hub shaft 10, a hub body 20 rotatably supported on the hub shaft via two bearing portions 3L, 3R apart from each other in the axial direction and a multistage free wheel 40 mounted to one end of the hub body 20. The multistage free wheel 40 includes a core 41 screwed to one end of the hub body 20 and having an extension extending from the end of the hub body and a sprocket support 42 supported on the outer periphery of the core 41 via two bearing portions 5a, 5b apart from each other in the axial direction and a one-way clutch so as to be rotatable in one direction for supporting a plurality of diameter-different sprockets S1-S7. An auxiliary bearing 70 is mounted between the hub shaft 10 and the extension of the core 41.
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