Abstract: To provide a bicycle hub unit and a bicycle wheel assembly that allow a wheel unit to be appropriately coupled to a hub body, a bicycle hub unit is coupled to a rotary body to which a brake is applied by a brake device. The bicycle hub unit includes a hub body that rotates around a hub axle and a rotary body coupling portion that couples the rotary body to the hub body. The hub body includes a first joint portion and a second joint portion. The first joint portion includes an external thread coupled to an internal thread of the wheel unit. The second joint portion is coupled to a restriction member that restricts relative rotation of the first joint portion and the wheel unit.

Abstract: To provide a bicycle hub unit and a bicycle wheel assembly that allow a wheel unit to be appropriately coupled to a hub body, a bicycle hub unit is coupled to a rotary body to which a brake is applied by a brake device. The bicycle hub unit includes a hub body that rotates around a hub axle and a rotary body coupling portion that couples the rotary body to the hub body. The hub body includes a first joint portion and a second joint portion. The first joint portion includes an external thread coupled to an internal thread of the wheel unit. The second joint portion is coupled to a restriction member that restricts relative rotation of the first joint portion and the wheel unit.

Abstract: To provide a bicycle hub unit and a bicycle wheel assembly that allow a wheel unit to be appropriately coupled to a hub body, a bicycle hub unit is coupled to a rotary body to which a brake is applied by a brake device. The bicycle hub unit includes a hub body that rotates around a hub axle and a rotary body coupling portion that couples the rotary body to the hub body. The hub body includes a first joint portion and a second joint portion. The first joint portion includes an external thread coupled to an internal thread of the wheel unit. The second joint portion is coupled to a restriction member that restricts relative rotation of the first joint portion and the wheel unit.

Abstract: To provide a bicycle hub unit and a bicycle wheel assembly that allow a wheel unit to be appropriately coupled to a hub body, a bicycle hub unit is coupled to a rotary body to which a brake is applied by a brake device. The bicycle hub unit includes a hub body that rotates around a hub axle and a rotary body coupling portion that couples the rotary body to the hub body. The hub body includes a first joint portion and a second joint portion. The first joint portion includes an external thread coupled to an internal thread of the wheel unit. The second joint portion is coupled to a restriction member that restricts relative rotation of the first joint portion and the wheel unit.

Abstract: A sprocket is engageable with a chain having rollers. The sprocket includes a body and a tooth portion. The tooth portion has front and rear surfaces, a drive side surface and a non-drive side surface. The rear and front surfaces face in opposite axial directions. The drive side surface axially connects the front and rear surfaces on a downstream side. The non-drive side surface axially connects the front and rear surfaces on an upstream side. One of the front and rear surfaces has a first chamfered portion, which is formed in a radially outer portion of at least one tooth portion and tapered radially outward in the axial direction. The drive side surface has a first protrusion, which protrudes downstream in the drive rotation direction and is located radially outwardly from a contact position where the drive side surface contacts each of the rollers when the chain is driven.

Abstract: A sprocket is engageable with a chain having rollers. The sprocket includes a body and a tooth portion. The tooth portion has front and rear surfaces, a drive side surface and a non-drive side surface. The rear and front surfaces face in opposite axial directions. The drive side surface axially connects the front and rear surfaces on a downstream side. The non-drive side surface axially connects the front and rear surfaces on an upstream side. One of the front and rear surfaces has a first chamfered portion, which is formed in a radially outer portion of at least one tooth portion and tapered radially outward in the axial direction. The drive side surface has a first protrusion, which protrudes downstream in the drive rotation direction and is located radially outwardly from a contact position where the drive side surface contacts each of the rollers when the chain is driven.

Abstract: A multi-speed internal bicycle hub transmission assembly includes a hub axle, a driver, a hub shell, a power transmission mechanism, a pawl and a pawl retracting mechanism. The driver is rotatably supported to the hub axle. The hub shell is rotatably supported to the hub axle. The power transmission mechanism is disposed between the driver and the hub shell for transmitting rotational power from the driver to the hub shell through at least a first power transmission path and a second power transmission path. The pawl is configured to transfer torque between the driver and the hub shell with torque being transferred along the first power transmission path. The pawl retracting member is configured to restrict movement of the pawl with torque transmitted along the second power transmission path.

Abstract: A multi-speed internal bicycle hub transmission assembly includes a hub axle, a driver, a hub shell, a power transmission mechanism, a pawl and a pawl retracting mechanism. The driver is rotatably supported to the hub axle. The hub shell is rotatably supported to the hub axle. The power transmission mechanism is disposed between the driver and the hub shell for transmitting rotational power from the driver to the hub shell through at least a first power transmission path and a second power transmission path. The pawl is configured to transfer torque between the driver and the hub shell with torque being transferred along the first power transmission path. The pawl retracting member is configured to restrict movement of the pawl with torque transmitted along the second power transmission path.