SRAM XX Eagle T-Type AXS Rear Derailleur - 12-Speed, 52t Max, (Battery Not Included), Wheel Axle Mount, Aluminum Cage, Black/SilverThe XX Eagle T Type AXS 12 Speed rear derailleur foundationally changes the relationship between cassette and derailleur. Engineered 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. Its game changing Full Mount attachment method creates a far stronger connection and grips both sides of the frame. This XX T