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Sram Eagle 90 E-MTB BCD groupset
Sram

Sram Eagle 90 E-MTB BCD groupset

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Features of Sram Eagle 90 E-MTB BCD

Product description of Sram Eagle 90 E-MTB BCD groupset

Description summary

Experience mechanical shifting at its best with the SRAM Eagle 90 E-MTB groupset. Leveraging the robust, hangerless Full Mount design from AXS Transmission, it delivers flawless shifting even under full E-MTB power. This groupset features a durable E-MTB crankset, a wide-range 10-52t T-Type cassette, and a premium mechanical shifter. With a revolutionary, guess-free setup and the most rebuildable derailleur SRAM has ever made, Eagle 90 offers an unparalleled ride experience with ultimate durability. For UDH frames only

Mechanical shifting at it’s best. Eagle 90 delivers the dream, and then some. Featuring the same Full Mount derailleur architecture as it’s AXS Transmission siblings, it is unquestionably robust. And for the just in case, the derailleur body features replaceable outer and inner parallelogram links, skid plates, and a tool-free threaded cage assembly, making it the most rebuildable derailleur we’ve ever built. At the heart of the system is a sleek and sturdy forged aluminum E-MTB crankset, with a drive-unit specific T-Type chainring. Shifting under load is a signature of Eagle Transmission, and this is made possible on 90 with an XS-1275 T-Type cassette that features full X-Sync technology, and a premium double-click T-Type Actuation mechanical shifter. For those inclined to DIY, mechanical Eagle Transmission has a revolutionary simple four step setup procedure: Prepare. Hang. Tighten. Route. Featuring no limit screws, no b-tension, and no guesswork. Built to take you as far as your imagination and body will allow, Eagle 90 Transmission provides riders with an unparalleled ride experience.

Features:

- Hangerless Interface (UDH) frame compatibility only.
- 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 aluminum lever touchpoint.
- Dedicated single-click variant required for E-MTB use.
- Black XG-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.

Specifications:

- Rear Derailleur: Eagle 90
- Shifter Right: Eagle 90
- Chainring: 34T
- Guard Included: Yes - Aeroguard
- Chain: GX T-TYPE 126
- Cassette: XS 1275 T-TYPE 10-52

Specifications

Manual

Technical specifications of Sram Eagle 90 E-MTB BCD

  • Cassette

    XS 1275 T-TYPE 10-52

  • Chain

    GX T-TYPE 126

  • Rear Derailleur

    Eagle 90

  • Shifters

    Eagle 90

  • Crankset

    Forged Aluminum E-MTB

  • Color

    Silver

  • Recommended Use

    MTB Cycling

  • Electronic

    No

Features of Sram Eagle 90 E-MTB BCD

Color Silver

Color

Silver

Recommended Use MTB Cycling

Recommended Use

MTB Cycling

Electronic No

Electronic

No

Key differentiators

Designed for UDH (Universal Derailleur Hanger) compatible frames only.

Engineered for E-MTB use, allowing for precise shifting under full power.

Equipped with a durable forged aluminum E-MTB crankset and a 34T chainring.

Features a robust, hangerless Full Mount derailleur design for enhanced durability.

Includes a wide-range 10-52t XS-1275 T-Type cassette for versatile gearing.

Technology in Sram Eagle 90 E-MTB BCD groupset

Energy rating

Warnings

/ 5

1 Reviews

What our customers are saying about Sram Eagle 90 E-MTB BCD groupset

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Include AI Generated questions and answers

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

Is the Sram Eagle 90 groupset designed for electric mountain bikes?

Answer of Generated by AI and verified

Yes, this groupset is specifically designed for E-MTB use. It features a durable, forged aluminum E-MTB crankset and a chain that is fully approved for E-MTB applications, ensuring it can handle the additional power and torque.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

Is this an electronic or mechanical shifting groupset?

Answer of Generated by AI and verified

The Sram Eagle 90 is a mechanical groupset. It features a premium mechanical shifter and does not use electronic or wireless shifting components.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

What makes the rear derailleur on this groupset durable?

Answer of Generated by AI and verified

The Eagle 90 rear derailleur is designed for durability with a robust, hangerless Full Mount design. It is also highly rebuildable, featuring replaceable outer and inner parallelogram links, skid plates, and a tool-free threaded cage assembly.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

Is the Sram Eagle 90 E-mtb Bcd Groupset worth the investment for mountain biking?

Answer of Generated by AI and verified

The Sram Eagle 90 E-mtb Bcd Groupset offers a robust mechanical shifting experience with a wide-range 10-52t cassette and durable components, making it a valuable choice for mountain biking users.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

What is the gear range of the cassette included with the Eagle 90 groupset?

Answer of Generated by AI and verified

This groupset includes an XS-1275 T-Type cassette with a wide gear range of 10-52 teeth, providing versatile gearing for varied MTB terrain.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

How many speeds does the Sram Eagle 90 groupset have?

Answer of Generated by AI and verified

This is a 1x12-speed groupset, featuring a single chainring at the front and a 12-speed cassette at the rear.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

What material is the crankset made from?

Answer of Generated by AI and verified

The E-MTB crankset included in this groupset is made from forged aluminum, selected for its sturdiness and durability.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

What technologies does the Sram Eagle 90 groupset feature?

Answer of Generated by AI and verified

This groupset incorporates Sram's Eagle and AXS Transmission technologies, including the hangerless Full Mount design and a T-Type cassette with full X-Sync technology for smooth shifting under load.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

Can I use this groupset for road cycling?

Answer of Generated by AI and verified

We do not recommend this groupset for road cycling. It is specifically designed and optimized for MTB cycling, particularly for E-MTBs, with components built to handle off-road conditions and power.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

Is this groupset designed for shifting under load?

Answer of Generated by AI and verified

Yes, a key feature of the Eagle Transmission system is its ability to provide smooth, flawless shifting even under the full power of an E-MTB. This is made possible by the XS-1275 T-Type cassette with full X-Sync technology.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

What type of frame is required for the Sram Eagle 90 groupset?

Answer of Generated by AI and verified

This groupset is compatible only with frames that feature a UDH (Universal Derailleur Hanger) interface. This is because it uses a hangerless, Full Mount derailleur architecture.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Sram Eagle 90 E-MTB BCD groupset

Is the shifter compatible with other brake levers?

Answer of Generated by AI and verified

Yes, the Eagle 90 shift lever features MMX compatibility, which allows for seamless pairing and a tidy cockpit setup with compatible SRAM brakes.

* Generated by AI based on customer and product data

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Frequently bought together
Best sellers

Use cases

Upgrading an E-Mountain Bike Drivetrain 90% Fit

This groupset is specifically designed for E-MTB use, offering a robust and reliable upgrade for committed riders. The durable aluminum crankset and wide-range cassette provide solid performance for tackling varied off-road terrain.

E-MTB specific design,10-52t cassette range,Forged aluminum crankset

All-Mountain and Trail Riding 90% Fit

With its wide 10-52t gear range, this groupset is a great all-rounder for trail riders who encounter steep climbs and fast descents. The 1x setup with a 34T chainring offers simplicity and efficiency for varied trail conditions.

10-52t cassette range,34T chainring,GX T-TYPE 126 chain

Building a Custom E-MTB 80% Fit

For riders building a custom E-MTB, this groupset provides a balanced package of performance and durability. It serves as a reliable core for a new build, ensuring dependable shifting and power transfer on demanding trails.

Complete groupset components,Aluminum crankset,Eagle 90 rear derailleur

Technical Climbing on an E-Bike 85% Fit

The massive 52t cog on the cassette provides an excellent climbing gear, making it easier to tackle steep, technical ascents. This allows E-MTB riders to maintain cadence and traction on challenging uphill sections.

10-52t cassette,Eagle 90 rear derailleur,Intended for MTB Cycling

Best for

Best for E-MTB Upgraders

This groupset offers a complete, integrated solution specifically for E-MTB use, providing assured performance and precise shifting for a more enjoyable and controlled ride on the trails.

Based on product features

Ideal for Regular Trail Riders

With its durable forged aluminum crankset and wide 10-52t cassette range, this groupset delivers the smooth, reliable shifting needed for varied and demanding trail conditions.

Based on product features

Great for Cyclists

Engineered for dedicated MTB cycling, this groupset provides the high level of shifting precision and control required to maintain momentum and tackle challenging terrain effectively.

Based on product features

Benefits

FunctionalConquer Any Climb and Descend with Confidence

The expansive 10-52t cassette range provides an exceptional spread of gears, ensuring you have the right option for both steep, challenging ascents and fast, open descents. This versatility allows you to maintain optimal cadence and power output across varied mountain biking terrain without running out of gears.

cassette_range: 10-52t

intended_use: MTB Cycling

FunctionalEfficient Power Transfer for All-Around Riding

The combination of a 34T chainring and the GX T-TYPE 126 chain is engineered for efficient and reliable performance in typical MTB scenarios. This setup provides a solid foundation for transferring your power to the trail, offering a balanced gearing for a mix of climbing and flat-land speed.

chainring_teeth: 34T

chain: GX T-TYPE 126

FunctionalDependable, Low-Maintenance Gear Changes

Featuring a traditional, non-wireless design, this groupset offers straightforward reliability and ease of maintenance. Riders can depend on the tactile feel and proven performance of mechanical shifting, simplifying trailside adjustments and reducing concerns about battery life.

wireless_shifting: No

rear_derailleur: Eagle 90

Ideal buyer profiles

The E-MTB Upgrader

This rider owns an electric mountain bike and is looking to replace or upgrade their current drivetrain. They seek a reliable, purpose-built groupset that can handle the specific demands of E-MTB riding, including higher torque and challenging trail conditions.

This groupset is specifically designed for E-MTB applications, featuring a robust forged aluminum crankset built to withstand the rigors of motorized assistance. The 10-52t cassette range provides ample gearing for steep climbs and fast descents, while the complete system ensures components work together seamlessly for consistent performance on the trail.

The Trail Performance Rider

This cyclist regularly tackles a variety of mountain bike trails and values components that deliver consistent, predictable performance. They prioritize smooth gear changes and a durable drivetrain that won't let them down mid-ride, allowing them to focus on the trail ahead.

With its Eagle 90 rear derailleur and shifters, this Sram groupset offers dependable shifting for MTB cycling. The inclusion of a guard provides extra protection on rough terrain, and the wide 10-52t cassette ensures the right gear is always available, enhancing the overall enjoyment and performance of the ride.

The Custom E-Bike Builder

This individual is building a custom electric mountain bike from the frame up. They are carefully selecting each component to create a high-performing, integrated machine tailored to their specific riding style and preferences.

This Sram Eagle groupset provides a complete, integrated drivetrain solution specifically for E-MTB builds. It includes all the core components, from the forged aluminum crankset to the wide-range cassette and chain, ensuring compatibility and delivering the performance expected from the Sram Eagle ecosystem.

Competitive features

When selecting a groupset for your E-MTB, compatibility with your motor system is the most critical factor. We're comparing the Sram Eagle 90 E-MTB BCD groupset with other models in the Eagle 90 family, such as those designed for Bosch and Brose/SRAM ISIS systems. While all share the core mechanical shifting performance and robust, rebuildable derailleur design, the key difference lies in the crankset and its interface with the e-bike motor.

Where it excels

The Sram Eagle 90 E-MTB BCD groupset is designed for e-bike motor systems that utilize a standard Bolt Circle Diameter (BCD) for chainring mounting, offering a versatile option for various bike builds. | It provides the same robust, hangerless Full Mount derailleur architecture and wide-range 10-52t T-Type cassette found in its sibling groupsets, ensuring reliable mechanical shifting under full E-MTB power. | This model features a highly rebuildable derailleur with replaceable links and skid plates, emphasizing long-term durability and serviceability.

Consider alternatives if...

If your E-MTB is equipped with a specific motor system like Bosch or Brose that requires a dedicated crankset interface, this BCD version will not be compatible. In that case, you must select the groupset variant explicitly designed for your motor (e.g., the Eagle 90 E-MTB Bosch or Brose versions).

Verdict

The Sram Eagle 90 E-MTB BCD Groupset is an excellent choice for riders whose e-bike systems use a standard BCD crank interface. It delivers the same durable, high-performance mechanical shifting experience as the rest of the Eagle 90 line. However, the choice is not about performance but compatibility. Your decision must be based on the specific motor system on your bike; choosing the wrong variant will result in an incompatible part.

Specs comparison

Favorite On Favorite Off
Favorite On Favorite Off
MaterialAluminumforged aluminumaluminum
Intended UseMTB CyclingE-bikes, MTB CyclingE-bikes, MTB Cycling
ChainGX T-TYPE 126Gx T-Type 126GX T-Type 126
Rear DerailleurEagle 90Eagle 90GX Eagle AXS T-Type
CassetteXS 1275 T-TYPE 10-52Xs 1275 T-Type 10-52XS 1275 T-Type 10-52

Specs vs competitors

Favorite On Favorite Off
Favorite On Favorite Off
Favorite On Favorite Off
Favorite On Favorite Off
MaterialAluminumaluminum-aluminum-
Intended UseMTB CyclingGravel cyclingRoad CyclingMTB CyclingGravel cycling
ChainGX T-TYPE 12612-speed12-speed12-speed12-speed
CassetteXS 1275 T-TYPE 10-52---10-51T 12-Speed
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