Sram universal derailleur hangerif youve ever snapped a gear hanger in the woods you know how infuriating it can be, so sram brings you its pivoting universal derailleur hanger udh, which is compatible with a wide range of bike frames and all major drivetrain brands. The pivoting design of this rear mechanism hanger rotates slightly in the event of a sudden impact, protecting your expensive shifting component. It then enables you to position your chain on to your smallest cog so you can get rolling again in no time.features material aluminium compatibility many frame brands models and sram, shimano, box and sunrace rear derailleurs use mountain bike mtb, electric mountain bike e mtb protects against chain jams improves shifting performance guarantees better alignment consolidates thousands of mountain bike derailleur standards offers unparalleled derailleur protection and perfect alignment rotates rearward on impact and features the ability to ldquore railrdquo the chain back onto the small cog part number ac drhg mtb a1buy sram components from chain reaction cycles, the world's largest online bike store.