The SX Eagle derailleur features the proven SRAM 1x-specific X-HORIZON design and easily facilitates 11-50t and 10-50t cassette capacity, providing quiet, consistent performance and durability! Ride more for less! The SX Eagle Derailleur includes all Eagle platform features with an aluminum cage X-SYNC pulley technology provides greater efficiency, crisper shifting, and quieter operation Cage Lock offers discovery-level riders easy trail-side wheel removal Drivetrain Speeds: 12 Cage Length: Long Chain Wrap Capacity (teeth): 40 teeth Largest Cog: 50 Rear Der/Shifter Compatibility: SRAM X-Actuation