SRAM Eagle Mechanical Transmission Drivetrain Review
Can a mechanical drivetrain shift under full power? Eagle 90 and 70 Transmission prove it can.
Unmatched Durability
Eagle Mechanical Transmission redefines durability with its Full Mount derailleur interface, which eliminates hangers and provides an ultra-secure connection to the frame. This innovative design minimizes failure points and prevents misalignment, ensuring a rock-solid drivetrain even in the roughest conditions. The Eagle 90 derailleur is particularly sustainable, with replaceable skid plates and outer and inner parallelogram links, making it the most rebuildable mechanical derailleur available.
Precision Shifting
With the precision of X-Sync tooth profiles and 44 optimized shifting points, combined with the Full Mount interface, Eagle Mechanical Transmission delivers the best cable actuated shifting under load—whether you’re climbing, sprinting, or pushing an E-MTB to its limits. The Eagle Mechanical drivetrains maintain precise and crisp gear changes in all conditions, with T-Type cable actuation providing smooth engagement every time. Shifting under power has never been this good on a mechanical groupset.
Quick & Easy Installation
Forget finicky adjustments—Eagle offers an incredibly simple “prepare, hang, tighten” installation. With no limit screws or B-tension to worry about, setup is foolproof and fast. Compared to AXS systems there is only one additional step required and that’s to simply route and tension a standard shift cable. The clearly marked Setup Cog on the cassette ensures alignment is quick and straightforward for all riders.
Rebuildable for Sustainability
The Eagle 90 derailleur is designed to be the most rebuildable derailleur ever. Riders can replace key components like the B-Knuckle, P-Knuckle, skid plates, and even the cage assembly with simple tools. Rebuild kits are readily available, ensuring longevity and serviceability. With replaceable bushings and pulleys, Eagle 90 minimizes downtime, allowing riders to repair rather than replace, keeping their drivetrain running smoothly for years to come.
Seamless T-Type Integration
As part of the Eagle Transmission ecosystem, all Eagle Mechanical components are fully compatible with other T-Type parts, whether electronic or mechanical. This allows riders to mix and match components while ensuring seamless performance across the board. The hangerless Full Mount design is exclusive to UDH-compatible frames, eliminating inconsistencies across different bike manufacturers and ensuring precise, reliable shifting in any setup.
Eagle 90 Transmission
Eagle 90 Transmission sets a new benchmark for mechanical shifting, combining Full Mount toughness with the most precise actuation ever seen in a cable-driven system. Its forged aluminium crankset, solid pin GX Eagle Flattop chain, and ultra-durable XS-1275 cassette work in harmony to provide unparalleled performance. With premium shift ergonomics and an ultra-reliable derailleur, Eagle 90 is the go-to choice for riders who demand top-tier mechanical performance.
Eagle 70 Transmission
Offering a balance of toughness, reliability, and simplicity, Eagle 70 Transmission delivers mechanical shifting excellence at a more accessible level. It retains the Full Mount design and T-Type compatibility, making it a robust foundation for any drivetrain. The stamped steel XS-1270 cassette, polished steel Flattop chain, and aluminium crankset provide dependable shifting under load, ensuring riders experience the benefits of Eagle Transmission without compromise.
