Chain guide of bicycle derailleur

A chain guide of a bicycle derailleur, comprising:

• a first guide member including:
• a first guide plate configured to be contactable with a chain;
• and
• a second guide member including:
• a second guide plate configured to be contactable with a chain and spaced apart from the first guide member;
• an extending part extending from the second guide plate toward the first guide plate, the extending part including:
• a first extending part having a first end portion, a second end portion, and a first intermediate portion positioned between the first end portion and the second end portion;
• and
• a second extending part having a third end portion, a fourth end portion, and a second intermediate portion positioned between the third end portion and the fourth end portion;
• the first intermediate portion of the first extending part being spaced apart from the second intermediate portion of the second extending part:
• the first end portion of the first extending part being coupled to the second guide plate;
• the third end portion of the second extending part being coupled to the second guide plate;
• and
• the second end portion of the first extending part being coupled to the fourth end portion of the second extending part, wherein
• the first guide member includes
• a first coupling arm configured to be pivotally coupled to a link member of a linkage structure, and
• a first additional coupling arm configured to be pivotally coupled to the link member of the linkage structure, the first additional coupling arm being spaced apart from the first coupling arm, and
• the first extending part is provided between the first coupling arm and the first additional coupling arm.

A chain guide of a bicycle derailleur, comprising:

• a first guide member including:
• a first guide plate configured to be contactable with a chain;
• and
• a second guide member including:
• a second guide plate configured to be contactable with a chain and spaced apart from the first guide member;
• and
• an extending part extending from the second guide plate toward the first guide plate,
• the extending part including a first extending part extending in a first extending direction and a second extending part extending in a second extending direction, the first extending direction being non-parallel to the second extending direction, the first extending part being at least partly spaced apart from the second extending part,
• the second guide member includes a guide-plate opening defined by the second guide plate, the first extending part, and the second extending part, and
• the guide-plate opening having a narrower width on a side closer to the first guide plate.