The SRAM Universal Derailleur Hanger (UDH) requires your frame to have a hanger-less interface that is compatible with the UDH specifications. In other words, your bike must have been designed to be compatible with the UDH; it won’t fit on every frame. Complete information about the UDH standard can be found at www.universalderailleurhanger.com. Additionally, the SRAM UDH Bike Finder lists all UDH bikes that are compatible with Eagle Transmission.