SRAM, NX Eagle, Rear Derailleur, Speed: 12, Cage: Long, Black

Completely new rear derailleur incorporating proven X-HORIZON™ design and new Type-3 ROLLER BEARING CLUTCH™ technology.
Eagle™ ecosystem-engineered mounting system and CAGE LOCK™ positioning add robustness.
Eagle™ pulley technology provides greater efficiency, crisper shifting and quieter operation.