NX Eagle Rear DerailleurThe Sram NX Eagle Rear Derailleur features the proven SRAM 1x specific X HORIZON design. The larger, 14 tooth X SYNC lower pulley easily facilitates 11 to 50 and 10 to 50 tooth cassette capacity, and also adds to NX Eagle's overall smooth pedalling feel. The Type 3 ROLLER BEARING CLUTCH provides quiet, consistent performance and durability. Features Completely new rear derailleur incorporating our proven X HORIZON design new Type 3 ROLLER BEARING