Bicycle derailleur

The A bicycle derailleur comprising:

• a shiftable portion configured and arranged to move between a top position and a low position;
• and
• a chain guide coupled to said shiftable portion to be laterally moved by said shiftable portion, said chain guide including
• an inner guide plate having an inner attachment end and an inner free end,
• an outer guide plate having an outer attachment end and an outer free end that are arranged to form a chain receiving slot between said inner and outer guide plates,
• a guide pulley rotatably coupled between said inner and outer attachment ends of said inner and outer guide plates,
• a tension pulley rotatably coupled about a rotation axis between said inner and outer free ends of said inner and outer guide plates, said tension pulley having an annular recess disposed about said rotation axis of said tension pulley to form a projection, and
• an annular, cup-shaped dust cap mounted axially between said inner guide plate and said tension pulley about said rotation axis,
• said inner guide plate having a guide section with a radially outermost edge of said guide section located in said annular recess, said projection projecting in an axial direction further from a center plane of said tension pulley than said outermost edge of said guide section.

A bicycle derailleur comprising:

• a shiftable portion configured and arranged to move between a top position and a low position;
• and
• a chain guide coupled to said shiftable portion to be laterally moved by said shiftable portion, said chain guide including
• an inner guide plate having an inner attachment end and an inner free end,
• an outer guide plate having an outer attachment end and an outer free end that are arranged to form a chain receiving slot between said inner and outer guide plates,
• a guide pulley rotatably coupled between said inner and outer attachment ends of said inner and outer guide plates,
• a tension pulley rotatably coupled about a rotation axis between said inner and outer free ends of said inner and outer guide plates, said tension pulley having an annular recess disposed about said rotation axis of said tension pulley to form a projection projecting in an axial direction from a center plane of said tension pulley, and
• a dust cap coupled between said inner guide plate and said tension pulley, said dust cap having a mounting portion and an annular portion extending from said mounting portion into said recess about said rotation axis,
• said inner guide plate having a guide section with a radially outermost edge of said guide section located radially inwardly of said projection and radially outwardly of said annular portion of said dust cap.