The Universal Derailleur Hanger consolidates thousands of hanger options across the industry. It protects your derailleur against chain jams by pivoting back and out of the way and slips slightly when encountering impacts. It improves shifting performance, guarantees better alignment, and works with all drivetrains. Plus, if you ever need a replacement, it will be available everywhere. The UDH. One hard-working hanger. Does your bike use a UDH? Check compatibility here: https://bikefinder.sram.com