A bicycle rear wheel adapter has an annular body that abuts a sprocket-carrying body that extends in an axially outer direction and receives sprockets in radially peripheral positions. A coupling element on the annular body couples with the sprocket-carrying body so the adapter rotates as a unit with the sprocket-carrying body, and a sprocket-receiving seat on the annular body couples with a sprocket so the adapter rotates as a unit with the sprocket. The adapter is suitable for cogsets with small sprockets grouped in a monolithic grouping.

A bicycle hub assembly comprises a sprocket support body. The sprocket support body includes at least ten external spline teeth configured to engage with a bicycle rear sprocket assembly. Each of the at least ten external spline teeth has an external-spline driving surface and an external-spline non-driving surface.

A bicycle hub assembly comprises a sprocket support body. The sprocket support body includes at least ten external spline teeth configured to engage with a bicycle rear sprocket assembly. Each of the at least ten external spline teeth has an external-spline driving surface and an external-spline non-driving surface.

A hub for a bicycle includes a hub shell and an axle device. The hub shell is supported rotatably relative to the axle device by way of bearing devices. A bearing device is configured as a roller bearing, and includes two bearing rings with rolling members disposed between, and is sealed axially outwardly. Between the bearing rings, the roller bearing includes a modular unit, at which a sealing unit is configured for laterally sealing the roller bearing, and including guide units protruding laterally inwardly from the modular unit for guiding the rolling members.

A hub assembly is provided for a human-powered vehicle. The hub assembly is basically provided with a hub axle, a hub body, an electric component and a user input device. The hub body is rotatably mounted on the hub axle to rotate around a rotational center axis of the hub assembly. The user input device is electrically coupled to the electric component.

A hub assembly is provided for a human-powered vehicle. The hub assembly is basically provided with a hub axle, a hub body, an electric component and a user input device. The hub body is rotatably mounted on the hub axle to rotate around a rotational center axis of the hub assembly. The user input device is electrically coupled to the electric component.

Provided is a clutch type driving wheel of an electric scooter. The clutch type driving wheel of the electric scooter includes a wheel body and a power shaft penetrating through the center of the wheel body, wherein a motor power input structure is arranged at one end of the power shaft, a central supporting shaft penetrates through the power shaft, a controlled clutch structure enabling the wheel body to be circumferentially positioned relative to the power shaft or enabling the wheel body to circumferentially rotate relative to the power shaft when the controlled clutch structure acts is arranged between the power shaft and the wheel body, and a clutch state locking structure is arranged on the controlled clutch structure. According to the clutch type driving wheel of the electric scooter, the clutch state locking structure is arranged between the power shaft and the wheel body. It is ensured that when the power shaft and the wheel body are in a transmission connection state or a mutual separation state, the state stability can be maintained.

Provided is a clutch type driving wheel of an electric scooter. The clutch type driving wheel of the electric scooter includes a wheel body and a power shaft penetrating through the center of the wheel body, wherein a motor power input structure is arranged at one end of the power shaft, a central supporting shaft penetrates through the power shaft, a controlled clutch structure enabling the wheel body to be circumferentially positioned relative to the power shaft or enabling the wheel body to circumferentially rotate relative to the power shaft when the controlled clutch structure acts is arranged between the power shaft and the wheel body, and a clutch state locking structure is arranged on the controlled clutch structure. According to the clutch type driving wheel of the electric scooter, the clutch state locking structure is arranged between the power shaft and the wheel body. It is ensured that when the power shaft and the wheel body are in a transmission connection state or a mutual separation state, the state stability can be maintained.

A mobile vehicle is disclosed herein. It comprises a car body having four wheels, an engine room on a front side thereof and a luggage compartment on a rear side thereof, and at least one drive motor disposed in the engine room or the luggage compartment or both and each of which has a motor body and a rotational shaft passing through a center of the motor body for driving the four wheels to rotate through a driver assembly.

A mobile vehicle is disclosed herein. It comprises a car body having four wheels, an engine room on a front side thereof and a luggage compartment on a rear side thereof, and at least one drive motor disposed in the engine room or the luggage compartment or both and each of which has a motor body and a rotational shaft passing through a center of the motor body for driving the four wheels to rotate through a driver assembly.