Abstract: A disc brake device and a bicycle. The disc brake device comprises a bicycle frame, a mounting shaft, a wheel, and a brake disc; fork pieces is fixedly connected to a frame body; the mounting shaft is fixedly connected to the fork pieces; a hub is movably connected to the mounting shaft; spokes are provided between the hub and a rim; the brake disc is fixedly connected to the hub; the brake disc and the wheel can rotate together with respect to the mounting shaft; the brake disc has an inner surface disposed facing the spokes and an outer surface disposed facing a fork piece; a first distance, in the axial direction of the mounting shaft, between the edge of the inner surface of the brake disc farthest from the hub in the radial direction of the mounting shaft and each spoke is less than or equal to 10 mm.

Abstract: A self-stabilizing vehicle includes a mass gyroscope which is fixed at an occupant compartment chassis corresponding to a portion where occupants sit. The occupant compartment portion may tilt outwards in response to the centrifugal force. If the vehicle has three or more wheels, the load is evenly distributed on the left wheel and the right wheel which move oppositely up and down about an effectively centrally-mounted shaft pin. Further, the present disclosure proposes a method for operating the self-stabilizing vehicle. According to the self-stabilizing vehicle and the operating method thereof, a vehicle having a narrow body may be used. When the vehicle undergoes external forces such as the centrifugal force and the crosswind, the occupant compartment can maintain the vertical stability even though the wheels may slide sideways.