The SRAM GX Eagle Rear Derailleur - 12 Speed, Lunar Max 52T 520% Range is a high-performance component that is perfect for mountain bikers who demand the best in performance and reliability. It features a 12-speed configuration and a Lunar Max 52T 520% range, providing riders with a wide range of gearing options to tackle any terrain. This rear derailleur is built with SRAM's X-HORIZON technology, which ensures precise and consistent shifting performance, even on the roughest terrain. It also features SRAM's ROLLER BEARING CLUTCH technology, which provides maximum chain stability and prevents chain slap, ensuring a smooth and quiet ride. The GX Eagle Rear Derailleur is constructed with durable materials, making it resistant to wear and corrosion. It is also designed with a sleek and stylish Lunar colorway, making it stand out from the crowd. This rear derailleur is easy to install and adjust, thanks to its straightforward design and user-friendly adjustments. It is compatible with SRAM's GX Eagle drivetrain system, making it the perfect upgrade for riders who want to improve their shifting performance and tackle more challenging trails. Overall, the SRAM GX Eagle Rear Derailleur - 12 Speed, Lunar Max 52T 520% Range is a top-of-the-line component that provides exceptional performance and durability.