SRAM AM AC UDH rear derailleur hanger. Aluminium. UDH: Universal Derailleur Hanger.
The UDH is designed to optimize shift performance across all bikes as well as create a sensible solution for replacing damaged hangers. The UDH has been widely adopted throughout the cycling industry with hundreds of models already featuring it.
UDH Frame types: https://bikefinder.sram.com/universal-derailleur-hanger-bikes
