Elevating 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™ Colorsystem, it comes in X01 Eagle™ master colorway to go perfectly with any color cassette and chain a rider wants. Details: Model No: X01 Eagle Rear Derailleur Series: X01 Eagle Cage: Long Speeds: 12 Max Cassette Teeth: 52 Cable Pull Ratio: X-actuation Color: Lunar, Red Weight: 286 g Compatibility: SRAM Eagle 10-50t & 10-52t cassettes All SRAM Eagle 12-speed chains All SRAM Eagle 12-speed trigger shifters