The SRAM NX Eagle Rear Derailleur is begging to be on your 1x drivetrain. It features SRAM's proven 1x-specific X-HORIZON design. With larger, 14-tooth X-SYNC lower pulley that easily handle 11- to 50- and 10- to 50-tooth cassette capacity, and don't forget an overall smooth-pedaling feel. The ROLLER BEARING CLUTCH provides quiet, consistent performance and durability. So you can shred the gnar with deadly silent precision.