Goat Links replace the direct mount link or B-Pivot knuckle on Shimano Shadow + Derailleurs to optimise the derailleurs position when using larger cassettes or extended cogs. 10 Speed Information: Why purchase a new drivetrain when you can increase the range of your Shimano 10-speed setup? The Goat Link compliments the Wolf Tooth Giant Cog for Shimano 10-speed drivetrains. We recommend this item for riders who are using the GC extender cog with their Shimano 10-speed drivetrains. The Goat Link re-positions the derailleur optimising shifting and improving longevity. Compatibility: The GoatLink will only work with Shimano Shadow+ (clutch) 10-speed rear derailleurs which use a Direct Mount link or B-pivot knuckle with a thickness of 7.9-8.1mm. Shimano made a running change in 2013, Shadow+ derailleurs purchased in 2013 and earlier will need to confirm fitment. Direct Mount-native frames are not supported. SRAM derailleurs are not compatible. Specifications: Eliminates the need for a longer b-screw. Stainless Steel mounting hardware included. 7075-T6 aluminium. 19g Improvements: Chain Wrap at 11t (effects cassette life): 40t: Improved by 69% 42t: Improved by 53% Free Chain at 11t (effects shifting precision): 40t: Improved by 25% 42t: Improved by 19% 11 Speed Information: The Goat Link 11 is optimised for using a 10-42 SRAM Cassette, with Shimano Derailleurs and Shifters. It also provides advantages for anyone running a GCX 44 cog on their SRAM cassette too. Compatibility: Cassette Compatibility 11-40 Not Required 11-42 Not Required 11-45 GS/SGS Derailleur 11-46 GS/SGS Derailleur 10-42 GS/SGS Derailleur 10-44 GS/SGS Derailleur (Wolf Tooth GCX44) 10-45 Not Optimised 9-44 Not Optimised Other notes: The GoatLink 11 is compatible with M8000 (XT) and M9000 (XTR) series eleven-speed Shimano rear derailleurs. The GoatLink 11 mounts only to standard derailleur hangers. Double chainrings (2x) is supported and requires a long cage (SGS) rear derailleur with no more than a 12t difference in front chainrings (with an 11-46 cassette). Triple chainrings are not supported. Direct Mount-native frames and SRAM derailleurs are not supported. Specs: Weight: 19g Material 7075-T6 Stainless Steel mounting hardware included Manufactured in Minnesota, USA