This replacement derailleur hanger 581 is CNC machined from 6061 aluminum in our Colorado shop to exacting tolerances. It features a black anodized finish, attaches with a custom M12 bolt (DROPOUT-FAST-05), M12x1.0 thru axle thread, and is compatible with Santa Cruz parts #23-20089 and #04-20894. Designed for short chainstay frames — includes DO bolt 26-15634. For long chainstay, see Derailleur Hanger 580.
