Bicycle hub assembly and bicycle transmission system

A bicycle hub assembly comprising:

• a hub axle defining a rotational axis;
• a hub shell rotatably mounted on the hub axle to rotate about the rotational axis;
• a sprocket support body rotatably mounted on the hub axle to rotate about the rotational axis, the sprocket support body being rotatable relative to the hub axle and the hub shell about the rotational axis;
• and
• a clutch having
• a first coupling state where a pedaling rotational force is transmitted from the sprocket support body to the hub shell in a first rotational direction during pedaling,
• a first release state where the hub shell is rotatable relative to the sprocket support body in the first rotational direction during coasting, and
• a second coupling state where a coasting rotational force is transmitted from the hub shell to the sprocket support body in the first rotational direction during coasting.