SRAM REAR XXSL EAGLE AXS 12s BLACK T-TYPE-BATTERY NOT INCLUDEDEngineered as integrated, interdependent transmission components, the T Type derailleur mounts around the wheel axle itself, contacting the cassette directly with a first of its kind Hangerless Interface Full Mount attachment method creates a far stronger connection and grips both sides of the frame Install and pair via the reliable and familiar standard AXS set up and pairing procedure Features an overload clutch, tucked in profile and Magic Wheel