SRAM REAR XX 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 New transmission derailleurs feature the same intuitive pairing and set up procedure as our Eagle AXS derailleurs Tucked in profile houses replaceable