SRAM GX Eagle Rear Derailleur - 12 Speed, Lunar Max 52T 520% RangeThe 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