Since its introduction, the award-winning Wolf Tooth RoadLink has given riders the ability to easily increase the range of their Shimano road drivetrains while maintaining near-factory levels of chain wrap and shifting performance *Fits Shimano&&';;s current generation GRX 810, R7000 105, R8000 Ultegra and R9100 Dura-Ace rear derailleurs *Replaces Shimano&&';;s stock Direct Mount allowing you to relocate the derailleur to provide clearance for larger-than-stock range cassettes *Maintains chain wrap and improves shifting *Fits standard derailleur hangers only (Direct mount derailleur hangers are not supported) *Optimized for use with 11-36t, 11-40t, and 11-42t 11-speed cassettes (will improve performance with 10-42t 11-speed cassettes, but not to factory levels) *Does not change the derailleurs total chain wrap capacity *CNC machined from 6061-T6 aluminum with stainless steel bolt *Made in the U.S.A. *Weight: 20g. (8g. more than stock)