Bicycle rear derailleur

A bicycle rear derailleur comprising:

• a base member configured to be mounted to a bicycle frame;
• a linkage structure pivotally coupled to the base member;
• a movable member pivotally coupled to the linkage structure such that the movable member is movable relative to the base member;
• a first pulley assembly pivotally or rotatably coupled to the movable member about a first pivot axis;
• and
• a second pulley assembly pivotally or rotatably coupled to the movable member about a second pivot axis spaced apart from the first pivot axis,
• an inclination angle being defined between a reference axis line and a hub axle line as viewed along the first pivot axis in a mounting state where the bicycle rear derailleur is mounted to the bicycle frame,
• the reference axis line passing through the first pivot axis and the second pivot axis as viewed along the first pivot axis,
• the hub axle line passing through a center axis of a front hub axle and a center axis of a rear hub axle as viewed along the first pivot axis, and
• the inclination angle being within a range having a lower limit not less than 0 degree and an upper limit not greater than 25 degrees.

A bicycle rear derailleur comprising:

• a base member configured to be mounted to a bicycle frame at a base mounting axis;
• a linkage structure pivotally coupled to the base member;
• a movable member pivotally coupled to the linkage structure such that the movable member is movable relative to the base member;
• a first pulley assembly including:
• a first pulley support pivotally coupled to the movable member about a first pivot axis, and
• a first toothed pulley configured to engage with a bicycle chain and rotatably coupled to the first pulley support about a first pulley axis spaced apart from the first pivot axis;
• and
• a second pulley assembly including:
• a second pulley support pivotally coupled to the movable member about a second pivot axis spaced apart from the first pivot axis, and
• a second toothed pulley configured to engage with the bicycle chain and rotatably coupled to the second pulley support about a second pulley axis spaced apart from the second pivot axis,
• an arrangement angle being defined between an arrangement line and a reference axis line as viewed along the first pivot axis,
• the arrangement line passing through the base mounting axis and the first pivot axis as viewed along the first pivot axis,
• the reference axis line passing through the first pivot axis and the second pivot axis as viewed along the first pivot axis, and
• the arrangement angle ranging from 100 degrees to 150 degrees.