Bicycle rear hub assembly

A bicycle rear hub assembly comprising:

• a hub axle including an axle through-bore that has a minimum inner diameter equal to or larger than 13 mm;
• a hub body rotatably mounted on the hub axle about a rotational center axis of the bicycle rear hub assembly;
• a sprocket support body rotatably mounted on the hub axle about the rotational center axis;
• and
• a freewheel structure including
• a first ratchet member including at least one first ratchet tooth, and
• a second ratchet member including at least one second ratchet tooth configured to engage with the at least one first ratchet tooth in a torque transmitting manner, wherein
• the first ratchet member is configured to engage with one of the hub body and the sprocket support body in a torque transmitting manner,
• the second ratchet member is configured to engage with the other of the hub body and the sprocket support body in a torque transmitting manner, and
• at least one of the first ratchet member and the second ratchet member is movable relative to the hub axle in an axial direction with respect to the rotational center axis.

A bicycle rear hub assembly comprising:

• a hub axle including an axle through-bore that has a minimum inner diameter equal to or larger than 13 mm;
• a hub body rotatably mounted on the hub axle about a rotational center axis of the bicycle rear hub assembly;
• a sprocket support body rotatably mounted on the hub axle about the rotational center axis;
• and
• a brake-rotor support body including at least one additional external spline tooth configured to engage with a bicycle brake rotor, wherein
• the at least one additional external spline tooth has an additional external-spline major diameter that is larger than the external-spline major diameter.

A bicycle rear hub assembly comprising:

• a hub axle;
• a hub body rotatably mounted on the hub axle about a rotational center axis of the bicycle rear hub assembly;
• and
• a sprocket support body rotatably mounted on the hub axle about the rotational center axis, the sprocket support body including at least ten external spline teeth configured to engage with a bicycle rear sprocket assembly, each of the at least ten external spline teeth having an external-spline driving surface and an external-spline non-driving surface, at least one of the at least ten external spline teeth being circumferentially symmetric with respect to a reference line extending from the rotational center axis to a circumferential center point of a radially outermost end of the at least one of the at least ten external spline teeth in a radial direction with respect to the rotational center axis, wherein
• the external-spline driving surfaces includes
• a radially outermost edge,
• a radially innermost edge, and
• a radial length defined from the radially outermost edge to the radially innermost edge, and
• a total of the radial lengths of the external-spline driving surfaces is equal to or larger than 7 mm.