SRAM Universal Derailleur Hanger - Aluminum, Black WeaponThe SRAM Universal Derailleur Hanger (UDH) consolidates thousands of hanger options across the industry, while protecting your derailleur against chain jams by pivoting back and out of the way, and slipping slightly when encountering impacts. It improves shifting performance, guarantees better alignment, and works with all drivetrains. The Universal Derailleur Hanger consolidates thousands of mountain bike derailleur standards UDH is designed to