SRAM X01 Eagle 12 Sp Rear DerailleurThis rear MTB derailleur features a rock-solid aluminium inner and outer construction, which makes it ideal at handling all the abuse that's associated with all-day epics in the mountains. SRAM has also equipped this top-tier Eagle series model with some of their finest technology, so you can benefit from faster and smoother shifting performance on your mountain bike. One final highlight is its updated cage design that provides superior chain retention and more precise shifts as you weave between the trails at speed.- Updated cage provides better chain retention and more precise shifts- Comes in X01 Eagle master colourway as part of Eagle Coloursystem - to go with all cassette and chain colour options- Backwards compatible, works with 10-50t and new 10-52t cassettesElevating the shift, expanding the capable, the X01 Eagle derailleur features an updated cage architecture, to provide better chain management than ever. The X01 Eagle rear derailleur works with the new 10-52t cassettes and is backwards compatible to also work with 10-50t options. As part of the new Eagle Coloursystem, it comes in X01 Eagle master colourway to go perfectly with any colour cassette and chain a rider wants.Features: Material: Aluminium Use: MTB Speed: 12 speed Mount: Standard Cable Pull Ratio: X-Actuation Max Tooth: 52 Type: Rear derailleur Part Number: Red: RD8138000; Lunar: RD8138001Technologies: X-Actuation: Developed specifically for SRAM 1x, X-ACTUATION keeps shifting sharp and consistent across the entire cassette. Eagle: Eagle technology represents our newest 1x drivetrain technology. Eagle is a lighter, simpler, more durable, and easier to use drivetrain. Eagle features all-new 1x components, engineered for even greater durability and performance while maintaining a significant weight advantage over other drivetrain solutions. Eagle technology also provides an expanded gear range of 500%, while is equal to 2x11 drivetrains. Cage Lock: With Cage Lock technology in the rear derailleur, wheel removal and installation - as well as chain installation - becomes faster and simpler. Just push the cage forward to create slack and lock it into place.Buy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.