Crashing a high end time trial bike is not something we'd ever wish to happen. The list of expensive go-fast goodies that could suffer is a long one, and replacing any of them would not be ideal. That's why this Ridley Dean Derailleur Hanger is a great idea. It's a failsafe for your expensive carbon frame and for your top-shelf rear derailleur. If it gets bent in a crash or mishap, it's cheap and easy to replace. We suggest having a spare in your tool kit just in case. After all, it would be bad to need one the night before a big event. The Dean Derailleur Hanger is made of aluminum and includes fresh hardware for installation.