Technical sheet

Sram SX Eagle A1 rear derailleur

Name: Sram SX Eagle A1 rear derailleur
Brand: Sram
SKU: 138048607
Price: 64.99 EUR
Availability: InStock
Rating: 5 (5 reviews)

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5 Reviews

4 Questions

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Size

Long

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Features of Sram SX Eagle A1

Product description of Sram SX Eagle A1 rear derailleur

Description summary

Conquer any trail with the SRAM SX Eagle A1 Rear Derailleur. This entry-level component unlocks the simplicity and massive gear range of 1x drivetrains. Featuring SRAM´s proven X-HORIZON™ design for precise, reliable shifting across its 12 speeds, it handles 11-50T and 10-50T cassettes. Enjoy enhanced efficiency and quieter operation with X-SYNC™ pulley technology. Cage Lock simplifies wheel changes, making maintenance a breeze. Upgrade your MTB with affordable, dependable Eagle performance

SRAM SX Eagle A1 12-Speed Rear Derailleur

Attributes: Long, MTB Cycling

Unlock the world of single-chainring simplicity and massive gear range with the SRAM SX Eagle A1 Rear Derailleur. This new SX Eagle derailleur is SRAM´s entry point to the SRAM Eagle Ecosystem, delivering the core performance and features that have redefined modern mountain biking. Designed for riders seeking reliable 1x performance without the top-tier price tag, the SX Eagle makes no compromises on the technology that matters most on the trail.

Experience the benefits of a drivetrain engineered for excellence. The SX Eagle A1 shares many features with the rest of the Eagle Ecosystem, including the proven SRAM 1x-specific X-HORIZON™ body design. This advanced architecture limits all movement to the horizontal axis, which makes ghost shifting impossible and also maintains a consistent chain gap across all gears. The result is faster, more precise, and incredibly reliable shifting across the entire cassette, giving you the confidence to change gears under load and on challenging terrain.

Versatility is at the heart of the SX Eagle. It is engineered to accommodate both 11-50T and 10-50T cassettes, providing you with the massive gear range needed to spin up the steepest climbs and power down the fastest descents. The SX Eagle is cross-compatible with much of the Eagle Ecosystem, making it easy to personalize and upgrade your ride when you are ready. This forward-thinking compatibility means you can invest in the Eagle platform today and seamlessly upgrade to higher-tier components in the future, personalizing your bike as your skills and budget grow.

As a full-featured Eagle derailleur, it is compatible with the Eagle Colorsystem, allowing you to perfectly match your components for a custom, pro-level look. Shifting performance is further enhanced by SRAM’s X-SYNC™ pulley technology, which provides greater efficiency, crisper shifting, and quieter operation for a smooth and silent ride. For ultimate practicality, the integrated Cage Lock offers discovery-level riders easy trailside wheel removal and installation, simplifying maintenance and getting you back on the trail faster.

Specifications:
- Use: MTB
- Gears: 1x12
- Cage: Long Cage
- Max. Tooth: 50T
- Outer Cage: Steel
- Inner Cage: Steel
- Pulleys: Steel
- Technology Highlights: X-ACTUATION™, X-HORIZON™

Specifications

Manual

Technical specifications of Sram SX Eagle A1

Features of Sram SX Eagle A1

Color Black

Color

Black

Recommended Use MTB Cycling

Recommended Use

MTB Cycling

Electronic No

Electronic

Box Size Long

Box Size

Long

Key differentiators

Constructed with durable steel for dependable performance on the trail.

Equipped with Cage Lock for easy and fast wheel changes and maintenance.

Features SRAM's proven X-HORIZON™ design for precise and reliable 12-speed shifting.

Incorporates X-SYNC™ pulley technology for quieter operation and improved chain retention.

Technology in Sram SX Eagle A1 rear derailleur

Energy rating

Warnings

4.8 / 5

5 Reviews

What our customers are saying about Sram SX Eagle A1 rear derailleur

This quality component offers excellent value for money, performing exactly as expected. The Sram SX Eagle A1 rear derailleur is a reliable choice, with confirmed compatibility for a Sunrace 11/50 11-speed cassette and an 11v XT shifter. It´s a well-regarded product with a great price-to-quality ratio, meeting specific needs without issue

Sram sx

2025/06/14

Fausto

Everything as described, fast and precise in delivery!

Very good

2024/08/25

João Simões

Very good product as expected

Top

2024/04/19

Didier

Value for money, nothing to complain about

12 to shame

2023/04/22

Ruibfc

Best price found, product which good relations price quality

Change sram

2022/10/30

ANTONIO

it is exactly the component I need and the price is perfect

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Include AI Generated questions and answers

2026-07-12

Generated by AI and verified

What are the main benefits of the Sram SX Eagle A1 Rear Derailleur?

Answer of Generated by AI and verified

The Sram SX Eagle A1 Rear Derailleur is designed to bring the performance and simplicity of a 1x drivetrain to more riders. Key benefits include precise and reliable shifting across all 12 speeds, thanks to the proven X-HORIZON™ design which prevents ghost shifting. It also features X-SYNC™ pulley technology for quieter operation and enhanced efficiency. Additionally, the Cage Lock feature simplifies wheel changes and maintenance, making it a dependable and user-friendly choice for mountain biking.

* Generated by AI based on customer and product data

2026-07-12

Generated by AI and verified

Is the Sram SX Eagle A1 derailleur suitable for mountain biking?

Answer of Generated by AI and verified

Yes, absolutely. The Sram SX Eagle A1 rear derailleur is specifically designed for mountain biking (MTB). Its durable steel construction, long cage design, and wide gear range capacity make it well-suited to conquer varied and challenging trails. It's an excellent entry-level component for riders looking to upgrade to a 1x12 speed drivetrain for MTB use.

* Generated by AI based on customer and product data

2026-07-12

Generated by AI and verified

Is the Sram SX Eagle A1 compatible with non-Sram components?

Answer of Generated by AI and verified

The Sram SX Eagle A1 is designed as part of the Sram Eagle Ecosystem. However, our product data confirms it has been used successfully with a Sunrace 11-50 11-speed cassette and an 11-speed XT shifter. For optimal performance and guaranteed compatibility, we recommend using it with other Sram Eagle 12-speed components.

* Generated by AI based on customer and product data

2024-07-14

CESAR

Sram SX Eagle A1 rear derailleur is compatible with a Sunrace 11/50 11-speed cassette and an 11v xt shifter thanks.

Answer of Bruno

Simply adjust the gear travel

* Generated by AI based on customer and product data

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Frequently bought together

Best sellers

Use cases

Upgrading to a 1x12 Drivetrain 90% Fit

12-speed compatibility,Long cage design,Handles up to 50T max sprocket

Cross-Country and Light Trail Riding 75% Fit

Its durable steel construction provides reliability for regular use on less aggressive trails.

Handles 10-50T and 11-50T cassettes,Durable steel cage,Mechanical actuation

or All-Terrain Hybrid Bike Build 70% Fit

For a versatile commuter or hybrid bike that sees both pavement and light gravel paths, this derailleur offers a massive gear range to handle steep city hills and faster flat sections with a simple 1x setup.

12-speed system,Long cage for wide gear range,Weather resistant

Aggressive Trail or Enduro Riding 20% Fit

While this derailleur provides the necessary gear range for enduro, its lack of a clutch mechanism significantly compromises chain security on rough, high-speed descents, leading to chain slap and a higher risk of dropped chains.

Handles up to 50T cassettes,Long cage design

Best for

Best for Riders

This derailleur delivers dependable, precise shifting across its 12 speeds, making it a solid performance upgrade for committed cyclists.

Based on product features

Ideal for All-Terrain Hobbyists

Based on product features

A Great Upgrade for a Smoother Ride

Featuring technology designed for quieter operation and smooth chain management, this derailleur contributes to a more enjoyable and enhanced ride.

Based on product features

Benefits

FunctionalConquer More Terrain with a Wide Gear Range

Experience enhanced capability across various landscapes, from steep climbs to fast descents. The wide 12-speed gearing and compatibility with large cassettes up to 50 teeth provide the right gear for any situation, giving you the flexibility to ride wherever you choose.

max_sprocket_teeth: 50 teeth (handles 11-50T and 10-50T cassettes)

FunctionalRide with Confidence in Any Weather

Gain peace of mind knowing your equipment is built to handle the elements. This derailleur's weather-resistant design ensures you can count on its performance whether you're riding in dry, dusty conditions or through wet and muddy trails.

weather_resistance: yes

Ideal buyer profiles

The Upgrader

This rider is looking to upgrade their mountain bike to a 12-speed system without a significant financial investment. They value reliable performance and broad compatibility, seeking a dependable component that delivers proven technology for their trail rides.

The Sram Sx Eagle A1 provides access to the Eagle 1x12 ecosystem, known for its dependable performance. The durable steel construction ensures longevity, making it a smart choice for a functional and affordable upgrade.

The Recreational Trail Rider

This individual enjoys hitting local trails on weekends and wants a drivetrain that just works. They aren't focused on shaving every gram but prioritize smooth, consistent gear changes and durability to handle regular use across different types of terrain.

This derailleur delivers the precision of Sram's X-HORIZON™ design, which ensures consistent shifting across all 12 gears. Its steel construction is built for durability, and the X-SYNC™ pulley technology contributes to quieter operation and a smoother ride. The ability to handle up to a 50-tooth sprocket provides ample range for climbing hills and accelerating on flats.

The DIY Bike Builder

This person is building a new bike from the frame up or undertaking a major overhaul of an existing one. They are looking for proven, readily available components that offer solid performance and are straightforward to install, allowing them to create a capable 1x drivetrain on a reasonable budget.

The Sx Eagle A1 is a cornerstone of the widely adopted Sram Eagle ecosystem, ensuring broad compatibility with other 1x12 components. Its mechanical actuation and direct-mount design are standard for modern frames, simplifying the build process. It offers reliable 12-speed performance, making it an excellent choice for a new build focused on function and value.

Competitive features

When choosing a rear derailleur for your mountain bike, the options can seem endless. We're comparing the Sram Sx Eagle A1 Rear Derailleur with several popular alternatives, including models from Shimano and Microshift. While all these components aim to provide reliable shifting, they approach performance and compatibility from different angles. This analysis focuses on the key characteristics of the Sram Sx Eagle A1 to help you understand its place in the market.

Where it excels

| It incorporates proven SRAM technologies like the X-HORIZON™ design for consistent shifting and X-SYNC™ pulleys for quieter operation and better chain management. | Features like Cage Lock simplify maintenance tasks such as wheel changes, making it a practical choice for riders who handle their own bike upkeep.

Consider alternatives if...

While the Sram Sx Eagle A1 is a capable entry-level component, riders seeking different shifting characteristics or specific compatibility within an existing non-SRAM drivetrain might explore other options. The provided data does not offer specific feature-for-feature comparisons on attributes like clutch mechanisms or materials, so consideration of alternatives would depend on personal preference or existing component ecosystems.

Verdict

The Sram Sx Eagle A1 Rear Derailleur stands out as a strong value proposition for mountain bikers looking to adopt a 12-speed single-chainring setup without a significant investment. It brings core features from the SRAM Eagle family, such as a wide gear range and reliable chain management, to an affordable price point. It's a dependable performer for trail riding and an excellent choice for upgrading or building a budget-conscious MTB.

Specs comparison

	Sram SX Eagle A1 rear derailleur	Sram Gx Type 2.1 Rear Derailleur	Sram Rival 22 Rear Derailleur	Sram Force 22 Wifli Rear Derailleur
Actuation	mechanical	mechanical	mechanical	mechanical
Adjustable Tension	false	false	false	false
Cage Length	long	long	medium	long
Clutch Mechanism	false	true	false	false
Compatibility	sram	sram	sram	sram
Installation Tools Required	false	false	false	false
Material	steel	aluminum	aluminum	Carbon Fiber
Max Chainring Teeth	50 teeth	36 teeth	50 teeth	50 teeth
Max Sprocket Teeth	50 teeth	42 teeth	32 teeth	32 teeth
Min Sprocket Teeth	10 teeth	10 teeth	11 teeth	11 teeth

Specs vs competitors

	Sram SX Eagle A1 rear derailleur	Shimano Slx M7100 Shadow Rd+ Direct Rear Derailleur	Microshift Advent Active Motion Rd+ Rear Derailleur
Actuation	mechanical	mechanical	-
Adjustable Tension	false	false	-
Cage Length	long	long	long
Clutch Mechanism	false	true	true
Compatibility	sram	shimano, sram	microshift
Installation Tools Required	false	false	-
Material	steel	aluminum	metal
Max Chainring Teeth	50 teeth	51 teeth	-
Max Sprocket Teeth	50 teeth	51 teeth	46 teeth
Min Sprocket Teeth	10 teeth	10 teeth	-