SRAM XX1 Eagle 12 Sp Rear DerailleurWhether you're competing in a cross-country event or shredding the MTB trails for leisure, this rear mech is engineered for fast and smooth operation. It features a carbon outer cage and a tough aluminium inner cage, which allows you to enjoy its fantastic durability, without sacrificing any weight. SRAM has also equipped this model with updated cage geometry that offers superior chain retention as well as crisper shifting. Another highlight is its backwards compatibility with 10-50T and more recent 10-52T cassettes.- Updated cage geometry provides better chain retention and crisper shifting- Comes in XX1 Eagle master colourway as part of Eagle Colour system - to go with all cassette and chain colour options- Backwards compatible, works with 10-50T and new 10-52T cassettesFeatures: Material: Outer Cage: Carbon; Inner Cage: Aluminium Use: MTB, Cross-Country Speed: 12 speed Type: Rear derailleur Max Tooth: 52T Mount: Standard Cable Pull Ratio: X-Actuation Single or Pair: SinglePart Number: RD8139000Buy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.