Problem Solvers Universal Derailleur HangerProblem Solvers Universal Derailleur Hanger. Problem Solvers Universal Derailleur Hangers The Universal Hanger replaces the drive side nut on the quick release skewer so you can get the majority of your gear range back. A vital tool to bring along when touring. Emergency on the trail derailleur hanger replacement Enables you to keep riding and use the majority of your gear range Compatible with most rear facing horizontal and vertical dropouts