The derailleur hanger serves as the mounting point for the rear derailleur, which is the component responsible for shifting the chain between gears on the rear cassette.

The hanger is designed to bend or break in case of a hard impact (like a crash), preventing damage to the more expensive bike frame or derailleur.

Different bikes have different designs for derailleur hangers, so they are usually specific to the frame model, this one is for the GRX gravel bike frame models of our brand, Rinos.

Because it's a separate piece, it can be replaced if damaged without needing to replace the entire bike frame, keeping it not costly for the user.