A bicycle rim is basically provided with a first annular side wall, a second annular side wall and an annular bridge. The first annular side wall includes a first braking contact portion. The second annular side wall includes a second braking contact portion. The annular bridge extends between the first and second annular side walls. At least one of the first and second braking contact portions has a plurality of soft additives at least partially embedded in a non-metallic layer.

A carbon fiber rim comprises a circular rim and a heat conduction layer. The circular rim comprises carbon fiber composites, and has two opposite side surfaces facing two brake pads and two opposite hooks extending outward radially to hold tires. The heat conduction layer is arranged on the side surface of the circular rim for forming a braking region facing the brake pad. The heat conduction layer comprises a porous or mesh heat conduction material. A bicycle including the aforementioned carbon fiber rim and the manufacturing method of the carbon fiber rim are also disclosed here. The carbon fiber rim can prevent distortion due to frictional heat when braking.

A carbon fiber rim comprises a circular rim and a heat conduction layer. The circular rim comprises carbon fiber composites, and has two opposite side surfaces facing two brake pads and two opposite hooks extending outward radially to hold tires. The heat conduction layer is arranged on the side surface of the circular rim for forming a braking region facing the brake pad. The heat conduction layer comprises a porous or mesh heat conduction material. A bicycle including the aforementioned carbon fiber rim and the manufacturing method of the carbon fiber rim are also disclosed here. The carbon fiber rim can prevent distortion due to frictional heat when braking.

A wheel rim includes a rim body, two firm tracks, and a plurality of hollow anti-thermal unit. The two firm tracks were mounted on two sides of the rim body, and these hollow anti-thermal units are spread in two firm tracks. The hollow anti-thermal unit can reduce transfer rate of the thermal when braking a car.

A wheel rim includes a rim body, two firm tracks, and a plurality of hollow anti-thermal unit. The two firm tracks were mounted on two sides of the rim body, and these hollow anti-thermal units are spread in two firm tracks. The hollow anti-thermal unit can reduce transfer rate of the thermal when braking a car.

A bicycle wheel rim including an outer annular portion adapted to receive a tire and an inner peripheral radial portion that has both a plurality of circumferentially arranged spoke openings and a braking surface on this portion.

A bicycle wheel rim including an outer annular portion adapted to receive a tire and an inner peripheral radial portion that has both a plurality of circumferentially arranged spoke openings and a braking surface on this portion.

A process for manufacturing a bicycle wheel component, comprising the steps of providing a component having at least one braking area that cooperates with a braking body made by molding of composite material having structural fibers in a polymeric material, and post-molding machining of at least one region of the braking area by removing only polymeric material, without removal of the structural fiber, from the entire region so that the structural fiber outcrops at least in part from the polymeric material, and removing the structural fiber and possibly the polymeric material according to at least one groove within the region. A bicycle wheel component having a braking area of composite material, wherein in a region of the braking area, the structural fiber outcrops at least from the polymeric material, and the region comprises a groove through the structural fiber and possibly the polymeric material of the composite material.

An electric vehicle motor with double disc brakes is provided, and relates to the field of electric vehicle motors. The electric vehicle motor includes a first disc brake, a motor body, fixed bolts and a second disc brake. A wheel rim is fixedly arranged on an outer surface of the electric vehicle motor. An upper shell is fixedly arranged at an upper end of the wheel rim, and a lower shell is fixedly arranged at a lower end of the wheel rim. The problem of braking may be well solved through double disc brakes, and traffic accidents due to poor braking of the electric vehicle at high speed, in long-time downhill periods or on rainy days may be effectively solved. Moreover, the first disc brake and the second disc brake are both made of aluminum alloy materials.

An electric vehicle motor with double disc brakes is provided, and relates to the field of electric vehicle motors. The electric vehicle motor includes a first disc brake, a motor body, fixed bolts and a second disc brake. A wheel rim is fixedly arranged on an outer surface of the electric vehicle motor. An upper shell is fixedly arranged at an upper end of the wheel rim, and a lower shell is fixedly arranged at a lower end of the wheel rim. The problem of braking may be well solved through double disc brakes, and traffic accidents due to poor braking of the electric vehicle at high speed, in long-time downhill periods or on rainy days may be effectively solved. Moreover, the first disc brake and the second disc brake are both made of aluminum alloy materials.