This replacement derailleur hanger 537 is CNC machined from 6061 aluminum in our Colorado shop to exacting tolerances. It features a black anodized finish, attaches with one M4x13mm flat head screw (6mm diameter head), M12x1.75 thru axle thread, and is compatible with Fuji D054 frames. Note: shares similar geometry with Derailleur Hanger 622, which has M12x1.5 axle threads — confirm before ordering.
