The SRAM NX Eagle 12-Speed Rear Derailleur features the proven SRAM 1x-specific X-Horizon design. The larger, 14-tooth X-SYNC lower pulley easily facilitates 11-50 tooth (and 10-50) cassette capacity for maximum climbing capacity. Larger jockey wheel also add to NX Eagle’s overall smooth-pedaling feel. The Type-3 Roller Bearing Clutch provides quiet, consistent performance and durability, rendering systems with fewer gears completely redundant. Compatible with existing Eagle systems, you can retro fit the SRAM NX Eagle 12-Speed Rear Derailleur to existing Eagle set ups, or start from scratch and add a 12 speed cassette to get your riding right up to date. Features: Proven SRAM X-Horizon design Type-3 Roller Bearing Clutch technology Eagle ecosystem-engineered mounting Extra robust Cage Lock positioning Efficient, quieter Eagle pulley technology Alloy/ steel construction Oversize 14 T lower jockey wheel