AXS features a two-button design that transforms the crucial act of rider inputs into a more personal experience for all your AXS controls- GX Eagle T-Type rear derailleur mounts around the wheel axle itself, contacting the cassette directly with a first-of-its-kind Hangerless Interface- GX Eagle T-Type derailleur offers the same intuitive pairing and set-up procedure as SRAM's Eagle AXS derailleurs- GX Eagle T-Type derailleur features things like removable skid plates for better protection and serviceability- Shifting under load is made possible on the GX Eagle T-Type cassette due to a combination of X-SYNC technology and cassette mapping, creating seamless shifts even during your hardest power output- Groupset includes: AXS POD Electronic Controller w/ Clamp. GX Eagle T-Type AXS rear derailleur w/ battery. GX Eagle T-Type XS-1275 10-52t cassette. 34 tooth chainring with Aeroguard. GX Eagle T-Type 126 Link 12-Speed Flattop chain. Battery charger.- Crank arms not included