Shift under full power with no compromise. The SRAM Eagle 90 Transmission is the first mechanical groupset to use the Full Mount interface. This upgrade delivers unmatched durability, simpler setup, and true power-on shifting without the need for a derailleur hanger. Built for serious riders, every part is engineered for long life, rebuildable, and reliable trail performance.Key Features and Benefits:Full Mount derailleur interface replaces the derailleur hanger: This connects the derailleur to both sides of the frame, not just the hanger. It adds strength and rigidity, which means more reliable shifting, even under high load. The outcome is unmatched durability and better performance when it matters most. Prepare, hang, tighten installation process: The derailleur installs using only three simple steps. No adjustment screws or complex alignment tools are needed. This reduces installation errors and saves time, making setup fast and repeatable.GX Eagle Transmission Flattop Chain: This chain has a unique shape that increases strength and smoothness. The benefit is consistent shifting with less chain wear, resulting in longer life and reduced maintenance.Eagle XS-1275 Cassette: Built with strong, lightweight materials and precise machining. It delivers smooth gear transitions under pressure. The outcome is accurate, quiet shifting over a wide gear range.Rebuildable Eagle 90 Transmission Derailleur: Designed to be taken apart and serviced. It lowers long-term cost and keeps the bike running like new. Riders benefit from a longer-lasting, more sustainable product.Eagle 90 Crankset with DUB technology: Uses oversized spindle and bottom bracket for better stiffness and alignment. The result is more efficient power transfer and fewer creaks or fit issues.Zero-compromise shifting under load: Every part of the system is made to shift smoothly under full pedalling power. This lets riders stay in control without easing off the pedals. The result is more confident riding in demanding terrain.No adjustment screws in derailleur design: This simplifies maintenance and reduces tuning needs. Shifting stays accurate longer, even after months of use. Riders get more time on the trail and less time in the stand.The Eagle 90 Transmission is designed for one purpose flawless mechanical shifting at every power level. Its Full Mount system solves the key weakness of hanger-mounted derailleurs, making it tougher and more secure. Its installation process is fast and repeatable, with no need for guesswork or special tools. The derailleur is fully rebuildable, the chain and cassette are proven across SRAM s Eagle line, and the whole system is tuned for high-load performance. This is mechanical shifting, built right.Put drivetrain problems behind you. Built for strength, made to shift under full load, and easy to service this is mechanical transmission done the right way. Take the step toward a groupset that does what it s built to do, every single time.Specification:Eagle Transmission XS-1275 CassetteGX Eagle Transmission Flattop ChainEagle 90 Transmission DerailleurEagle 90 Transmission CranksetEagle 90 Transmission Shifter