Goatlinks are designed to optimize the derailleur's position relative to your cassette. Offered in two versions - a 10-speed and 11-speed, each is intended to improve the shifting of your 1x drivetrain.Optimized for using a Shimano XT 8000 or XTR 9000 Rear Derailleur with a 10-42, 10-44, 11-45, 11-46 rear cassette setupCompatible with M8000 (XT) and M9000 (XTR) series eleven-speed Shimano rear derailleursDouble chainrings are not currently supportedTriple chainrings are not supportedDirect Mount-native frames and SRAM derailleurs are not supported Wolf Tooth GoatLink Rear Derailleur Adaptor Miscellaneous Rear Derailleur Part UPC: 812719021937