Key Features:Compatible With Shimano Shadow+ 10-speed Rear Derailleurs (Clutch Type Only),The Goatlink Is Optimized For Use With Wolf Tooth\'s 40- And 42-tooth Gcs And All Sizes Of Drop-stop Chainrings - But Will Work With Any 11-40t Or 11-42t 10-speed Cassette.,Direct Mount-native Frames And Sram Rear Derailleurs Are Not Supported.,You Will Never Need A Longer B-screw With The Goatlink,*Due To Variations In Derailleur Hanger Geometry, Chainstay Length, Chainring Size, B-screw Adjustment, And Suspension Configuration, Individual Results Will Vary Slightly. .