The SRAM Red XPLR AXS 12-Speed Rear Derailleur brings the proven AXS wireless electronic shifting to the gravel scene. Designed to be used in conjunction with the 12-speed XPLR 10-44t cassette, this derailleur lets us enjoy lightning-fast, crisp shifting on rides that take us off the beaten path. Large X-SYNC pulleys with ceramic coated bearings ensure that no watt is wasted when we switch into low gear for the next singletrack climb.