The RoadLink is a simple device that offsets the position of your Shimano road derailleur to make it possible to run a wide-range mountain bike style cassette. It is an ideal solution for riders looking to convert their road, gravel, cyclocross, or commuter.10-42 setup not supportedWorks with all 10-11 speed Shimano and SRAM Road DerailleursThe RoadLink is optimized for use with ten or eleven-speed 11-36t, 11-40t and 11-42t cassettesBest used with Single or Double Setups - see manufacturer's site for more details Wolf Tooth Roadlink Miscellaneous Rear Derailleur Part UPC: 812719021869