Eagle Transmission requires that the frame is Universal Derailleur Hanger (UDH) compatible due to its unique hanger-less design. Any frame with a UDH compatible hanger-less interface can be upgraded to Eagle Transmission. Complete information about the UDH standard can be found at www.universalderailleurhanger.com. Additionally, the SRAM UDH Bike finder tool lists all UDH bikes that are compatible with Eagle Transmission.