Nukeproof sram universal derailleur hanger udhthe sram universal derailleur hanger udh from nukeproof is a replacement derailleur gear hanger that's compatible with any frame that uses the sram udh standard.this is a replacement sram universal derailleur hanger udh made by nukeproof. This hanger is fully compatible for any frame which uses a sram udh hanger including the 2021 nukeproof mega giga bikes. The udh is designed to rotate rearward in the event of an impact and features the ability to “re rail” the chain back onto the small cog the udh works with all brands of drivetrain, not just sram. Please note if your frame does not currently have a udh hanger fitted, this will not be compatible features genuine replacement sram udh gear hanger from nukeproof fully compatible with any frame which uses a sram udh hanger the udh works with all brands of drivetrain, not just srambuy nukeproof frames forks from chain reaction cycles, the world's largest online bike store.