| 摘要 |
A bicycle disc brake hub 1 is basically provided with a hub axle 10 and a hub shell 11 rotatably disposed about the hub axle 10. The hub shell 11 has a pair of flanges with a tubular portion 40c extending between the flanges, and a rotor attachment portion 30 configured to prevent an inside diameter of a disc brake rotor from increasing when the diameter of the hub axle 10 increases. The rotor attachment portion 30 is provided in the vicinity of a first shell end 24 of the hub shell 11, and has a smaller outside diameter than the outside diameter of the tubular portion 40c. A rotor of a disc brake device is attached to the rotor attachment portion 30.
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