The Universal Derailleur Hanger â or UDH â consolidates thousands of mountain bike derailleur standardsOffers unparalleled derailleur protection and perfect alignment, guaranteedThe UDH is designed to rotate rearward in the event of impact and features the ability to âre-railâ the chain back onto the small cogWorks with all commercially available MTB and E-MTB drivetrains including Shimano, Box and Sunrace*Compatible with frames designed for its use - does not replace existing hangers, designed to be a new standardBlack/SilverUDHUPC/EAN/GTIN: 710845927461