Wheels Manufacturing Universal Derailleur Hanger – 404-9 For Frames designed to accept SRAM UDH Black/Green. Wheels Manufacturings SRAM compatible Universal Derailleur Hanger simplifies thousands of hanger designs into one universal standard. Machined completely out of aluminum this new hanger is not only strong but designed to rotate backward and slip slightly in the case of an impact preventing chain jams and protecting the drive train. All Wheels Manufacturing replacement derailleur hangers are produced in our Colorado shop to exacting tolerances.