What Our Gearhead(R) Experts Are Saying: "The Eagle 90 setup completely changes what I thought mechanical shifting could be. The Full Mount derailleur is super solid, setup is refreshingly simple, and the feel under load is crisp-even better than some electronics I've ridden. Plus, being able to rebuild everything is a huge bonus for long-term use."Eagle 90 Transmission is mechanical shifting reimagined-bringing the performance pedigree of SRAM's Eagle AXS architecture into a robust, rider-rebuildable system. At the heart is the Full Mount Eagle 90 derailleur, sharing the same hangerless interface as its electronic siblings, with tool-free cage serviceability and replaceable wear parts. It's SRAM's most rebuildable derailleur yet, built to take hits and keep going. A forged aluminum crankset anchors the system with E-MTB-ready stiffness and drive unit-specific offsets, while the XS-1275 T-Type cassette offers a 10-52T range and full X-SYNC tech for smooth, confident shifts under load. The system pairs with a premium aluminum Eagle 90 mechanical shifter, featuring stealthy ergonomics and a crisp double-click actuation. Whether you're hammering on the pedals or wrenching in the garage, this groupset is built for those who demand control, durability, and a clean, intuitive setup.