Specialized Rev4 Alloy Road Derailleur Hanger Description: The Specialized Rev4 Alloy Road Derailleur Hanger is an OEM replacement part for several Specialized and S-Works road bikes and lifestyle bikes. To choose the correct derailleur hanger for your bike, the hanger must be identical in appearance to the one it is replacing. Carefully compare images with the actual hanger to ensure that the shape is the same and that the bolt holes are in the same locations. Not the exact hanger you're looking for? Check out our selection of Specialized Rear Derailleur Hangers. Features: Genuine Specialized replacement parts For SCS (Short Chainstay) Bike Models Includes M3 mounting bolts Specifications: Color: Black Material: Alloy