SRAM SX Eagle rear derailleur, 12-speed, long cage, black

Equipped with SRAM’s proven X-HORIZON design from the 1x models, allowing easy use of an 11-50T cassette while delivering consistent, quiet performance and durability
Complete Eagle derailleur with more Eagle options than ever before
X-SYNC pulley technology delivers greater efficiency, crisper shifting and quieter operation
CAGE LOCK makes wheel changes easier and faster