The XLC derailleur hanger DO-A12 is a vital spare part for your bike. If your bike has a rear derailleur, then it will have a hanger to attach to the frame. However, each hanger is made to fit different shapes and specifications. The DO-A12 is ideal for city, trekking, mountain, road, and race bikes. Keep your gears running smoothly with this sturdy component from XLC. Constructed from aluminium, the XLC derailleur hanger DO-A12 is durable, so it doesn't bend easily. It has two holes, one to attach to the frame and one to attach to the rear derailleur. The hangers are designed to be replaced over time and protect your bike from damage if the derailleur breaks or snaps off.