Bicycle derailleur, chain guide assembly and structural reinforcement sheet thereof

A structural reinforcement sheet, configured to be disposed on a chain guide assembly, comprising:

• a main body portion;
• a first corner portion;
• and
• a second corner portion, wherein the main body portion is located between and connected to the first corner portion and the second corner portion;
• wherein each of the first corner portion and the second corner portion has a convex curved surface facing outward and not facing an inner plate of the chain guide assembly;
• wherein the first corner portion and the second corner portion are bent from the main body portion towards the same direction so as to form the structural reinforcement sheet as a U-shaped sheet.

A chain guide assembly, configured to be mounted on a linkage assembly of a bicycle derailleur, comprising:

• an inner plate;
• an outer plate, spaced apart from the inner plate;
• a first connecting bridge, wherein two opposite sides of the first connecting bridge are respectively connected to the inner plate and the outer plate, and the first connecting bridge has a pivot part;
• and
• a second connecting bridge, wherein two opposite sides of the second connecting bridge are respectively connected to the inner plate and the outer plate;
• wherein the inner plate, the outer plate, the first connecting bridge, and the second connecting bridge are made of a single piece;
• wherein the first connecting bridge has only one pivot part having only one pivot hole.

A chain guide assembly, configured to be mounted on a linkage assembly of a bicycle derailleur, comprising:

• an inner plate;
• an outer plate, spaced apart from the inner plate;
• a first connecting bridge, wherein two opposite sides of the first connecting bridge are respectively connected to the inner plate and the outer plate;
• and
• a second connecting bridge, wherein two opposite sides of the second connecting bridge are respectively connected to the inner plate and the outer plate;
• wherein the inner plate, the outer plate, the first connecting bridge and the second connecting bridge are made of carbon fiber compound material, and the inner plate, the outer plate, the first connecting bridge and the second connecting bridge together form an opening by an integral connection thereamong.

A chain guide assembly, configured to be mounted on a linkage assembly of a bicycle derailleur, comprising:

• an inner plate;
• an outer plate, spaced apart from the inner plate;
• a first connecting bridge, wherein two opposite sides of the first connecting bridge are respectively connected to the inner plate and the outer plate;
• and
• a second connecting bridge, wherein two opposite sides of the second connecting bridge are respectively connected to the inner plate and the outer plate;
• wherein the inner plate, the outer plate, the first connecting bridge and the second connecting bridge are made of carbon fiber compound material, and the inner plate, the outer plate, the first connecting bridge and the second connecting bridge together form an opening by a non-riveting, non-screwing or non-snap-fit manner.

A chain guide assembly, configured to be mounted on a linkage assembly of a bicycle derailleur, comprising:

• an inner plate;
• an outer plate, spaced apart from the inner plate;
• a first connecting bridge, wherein two opposite sides of the first connecting bridge are respectively connected to the inner plate and the outer plate;
• and
• a second connecting bridge, wherein two opposite sides of the second connecting bridge are respectively connected to the inner plate and the outer plate;
• wherein the inner plate, the outer plate, the first connecting bridge and the second connecting bridge are made of carbon fiber compound material, and the inner plate, the outer plate, the first connecting bridge and the second connecting bridge together form an opening by an integral connection thereamong and a non-riveting, non-screwing or non-snap-fit manner.