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SRAM X4 Rear Derailleur 789 Speed Long Cage Black MFPN=184 004 039 Rotor Size (mm) 180 Pad Rotor Size (mm) 180 Pad Compatibility All Pad Compounds Rotor Type Two Piece Weight 134 keyword search TRP 25 Hub Disc Compatibility Center Lock 8 clamp Di2 Black Affordable and reliable derailleur is great for repairs and upgrades color:white
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