This replacement derailleur hanger 587 is CNC machined from 6061 aluminum in our Colorado shop to exacting tolerances. It features a black anodized finish, attaches via M16 nut, M12x1.0 thru axle thread, and is compatible with Rocky Mountain part #1812002 frames. For M12x1.5 axle threads, use Derailleur Hanger 513.
