The XX SL Eagle T-Type AXS(TM) 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 (Requires frame with UDH interface). Its game-changing Full Mount attachment method creates a far stronger connection and grips both sides of the frame. This XX SL T-Type rear derailleur features the same intuitive pairing and set-up procedure as Eagle AXS(TM) derailleurs.Features an overload clutch and a tucked-in profile removing all but what's neededAccommodates common maintenance and to further its race-day performance comes with a lower pulley called "Magic Wheel" that keeps spinning if an object becomes lodgedOnly compatible with frames featuring a UDH rear derailleur type interfaceFeatures a carbon cage a replaceable outer link and b-knuckle cover for lightweight and easy maintenenceBattery Not Included