SRAM Eagle 90 eMTB 104 BCD Transmission Groupset

Built around the Full Mount derailleur architecture, the Eagle 90 is engineered for strength and serviceability. It’s the most rebuildable derailleur SRAM has ever made, with replaceable links, skid plates, and a threaded cage assembly that needs no tools. Matched with a forged aluminium crankset and T-Type chainring, this system is built for high-load eMTB riding. The XS-1275 cassette, Single Click shifter, and Flattop chain deliver smooth, accurate shifts under pressure.

Key Features and Benefits:

• Full Mount derailleur design with a hangerless interface (UDH): Delivers a more secure connection to the frame. This enhances shifting stability and reduces potential for misalignment. The result is consistent performance and less maintenance over time.
• Replaceable inner and outer parallelogram links, skid plates, and cage assembly: Allows for easy replacement of high-wear components. This reduces the need for full derailleur replacement. Long-term durability is improved, and repair costs are lowered.
• Forged aluminium eMTB-specific crankset with T-Type chainring: Designed for high-stress pedal loads. Offers superior power transfer to the drivetrain. Riders get more efficiency and performance on steep and technical terrain.
• XS-1275 T-Type cassette with X-SYNC technology: Built for load-resistant shifting. Provides firm chain engagement on both inboard and outboard shifts. Shifting remains precise even under full power.
• E-MTB Single Click shift lever with premium textured aluminium touchpoint: Prevents multi-gear shifts to protect drivetrain components. Ensures smoother, safer operation under load. Gear changes are more predictable and drivetrain lifespan is extended.
• Simplified four-step mechanical setup: Prepare. Hang. Tighten. Route.: Removes guesswork from installation. No limit screws or b-tension adjustments are needed. Setup becomes fast, accurate, and repeatable even for home mechanics.
• GX Eagle Transmission Flattop chain with solid pins: Engineered for eMTB torque demands. Offers improved chain retention and reduced wear. Boosts drivetrain reliability across all riding conditions.
• Available in SRAM/Brose and Bosch-specific chainring offsets with Gap Cap: Matches a wide range of drive unit designs. Ensures optimal alignment and a clean look between crank and ring. Enhances compatibility and aesthetics for eMTB builds.

Precision, strength, and serviceability are top priorities for eMTB riders. Eagle 90 meets those needs with components that resist wear, simplify maintenance, and support power-loaded riding. With its rebuildable derailleur and robust drivetrain setup, it’s designed to perform in the most demanding conditions without compromise.

Get more out of every ride with a groupset that’s made to last, shift cleanly under pressure, and install with minimal hassle. Designed for the modern eMTB rider who needs performance, reliability, and long-term value.

Specification:

• Hangerless Interface (UDH) frame compatibility only
• Distinct black and silver finish
• Available in SRAM/Brose and Bosch specific chainring and crankset offset variants with “Gap Cap” for a seamless between crank and ring. Forged aluminium crank arms available in 160mm, 165mm, 170mm lengths. Includes clip-on guard
• 34t 104bcd variant available without crank arms for compatibility with all other drive unit manufactures
• Eagle 90 shift lever features stealth architecture, and MMX compatibility for seamless pairing with SRAM brakes. Cockpit tidying Shift Housing/Brake Hose clip included
• Shift lever is built with modern shift ergonomics and a premium textured aluminium lever touchpoint
• Dedicated single-click shift lever variant required for E-MTB use
• Black XS-1275 features 10-52t range and full X-SYNC technology for best inboard and outboard shifting performance under load.
• Full Mount Eagle 90 derailleur is the most rebuildable Eagle Transmission derailleur, with replaceable B-Knuckle, Inner/Outer Links, Bash Guards, Bushings, Cage, and Cage Assembly
• Includes GX Eagle Transmission Flattop chain with solid pins, fully approved E-MTB use