More than a mechanical derailleur with a battery and a motor bolted on; the Eagle AXS derailleur is the heart of the whole AXS system. It features a cage with 10mm more ground clearance, with more chain wrap on the cassette to sit slightly further forward and further inboard from mechanical Eagle. Instantaneous shifts from a single touch even while under World Cup-winning chain loads recorded in the heat of racing and affirmed in the test lab. Tested to IP69K water and dust proofing standard, so whatever race day brings, you’re ready. ** Battery sold separately Details: Model No: RD-XX-1E-A1 Series: XX1 Eagle AXS Cage: Long Speeds: 12 Max Cassette Teeth: 52 Cage Material: Carbon Bearing Material: Steel Color: Black Battery sold separately Compatibility: Cassette: SRAM Eagle 10-50t & 10-52t cassettes Chain: SRAM Eagle 12-speed chains Shifter/Controller: SRAM AXS controllers