**Rewritten Description:** This rear derailleur hanger is a protective frame accessory for your bike's transmission. Made from durable 6061 aluminum alloy, it offers controlled deformation to safeguard your drivetrain during impacts. In case of a crash, the hanger may break but is easily replaceable, lowering repair costs. Its CNC-machined design ensures stiffness for precise shifting while acting as a sacrificial part to protect the frame. A direct-fit upgrade, it includes installation hardware and instructions. The hanger prevents rear derailleur damage, maintains transmission alignment, and enhances performance. **Key Features:** - 6061 aluminum alloy for impact protection - Stiffer than standard hangers - Easy direct replacement - Protects rear derailleur and frame - Improves shifting precision - Cost-effective maintenance solution