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SRAM Unisex Adult Eagle GX X-Actuation™ Trigger Shifter, Grey, 12 Speeds

4.8 4.8 out of 5 stars 689 ratings

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Brand SRAM
Color Lunar
Material Aluminum
Item Weight 454 Grams
Mounting Type Clamp-On Mount

About this item

  • Experience precise and reliable shifting with the thoughtfully designed cage architecture of the GX Eagle Rear Derailleur.
  • Enjoy the flexibility of using both 10-50t and 10-52t cassettes with the backwards compatible design.
  • Enhance your bike's aesthetics with the GX Eagle master colorway, part of the Eagle Colorsystem, which complements all colors of Eagle cassettes and chains.
  • Benefit from greater durability with the updated mounting system and re-positioned Cage Lock, along with sealed cartridge pulley bearings.
  • Get the job done with the long cage, 12-speed Lunar-colored GX Eagle Rear Derailleur, designed for improved chain retention and chain management.

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Product Description

different angles of a black bike derailleur

Rear Derailleur GX Eagle 12 speed Lunar Max 52T

bike derailleur lunar color

SPECIFICATIONS

  • Speed (RD): 12s
  • Cable pull ratio: X-actuation
  • Cage (RD): Long
  • Max tooth: 52
  • Colors (RD): Black & Lunar
  • Pulley bearings material: Steel
  • Cage material (RD): Aluminum

FEATURES

  • Backwards compatible, works with both 10-50t and new 10-52t cassettes.
  • Updated cage architecture provides better chain retention and precise shifts.
  • Comes in GX Eagle master colorway as part of Eagle Colorsystem and goes with all colors of Eagle cassettes & chains – from Black to Gold to Rainbow, to HardChrome and new Copper.

bike drive train

derailleur detail

derailleur up close

Riders want the derailleur to do its job shifting on command, whether under climbing load or the stage finish. The GX Eagle derailleur gets it done with an updated cage architecture that improves chain management.

Refined to work with the new 10-52t cassettes, it’s also backwards compatible for the 10-50t versions. Giving riders choice, because that’s how it should be.

Finished with the new GX Eagle master colorway – to compliment any cassette and chain colorway a rider wants from the Eagle Colorsystem. Further proof that the GX Eagle derailleur is there for one thing - to do the job.

derailleur installation

INSTALLING THE GX EAGLE REAR DERAILLEUR

  1. Use the derailleur hanger alignment tool to make sure the hanger is straight before installing the derailleur.
  2. Do not apply grease to the threads of the derailleur mounting bolt or hanger.
  3. Make sure the B-adjust tab is positioned properly against the hanger. Ensure that there are no gaps between the B washer and the rear derailleur hanger.
  4. Use a 5mm hex wrench to thread the derailleur mounting bolts into the hanger. Tighten bolt to 10 to 12 Newton meters, ensuring the B-adjust tab stays pressed against hanger while tightening the mounting bolt.

bicyclist biking up mountain road

ABOUT SRAM

RELENTLESS

To be the best. It’s why you ride. It’s why we build components. The perfect combination of precision and brute force. No obstacles stopping us. No limitations slowing us down. Ours is a relentless pursuit: to make the climb shorter, the trail smoother, the turn tighter, the descent faster. To give you the strongest, lightest, quickest bike on earth. To be the best.

A HISTORY OF INNOVATION

SRAM was founded on a single product in 1987 and introduced the Grip Shift (or twist shift) shifter to the road bike market in 1988. In 1991 that technology was adapted for mountain bikes, and SRAM quickly grew.

SRAM FUNDAMENTALLY BELIEVES THAT:

  • Bicycles improve the environment.
  • Bicycles ease traffic congestion.
  • Bicycles reduce the cost of transportation.
  • Bicycles improve health and reduce obesity.

Cyclists are a passionate user group that support and enhance the areas in which they ride.

SRAM’s products promote sustainability – they empower people to transport themselves and their families at low cost, to stay healthy, and to reduce pollution and improve community by reducing the use of fossil fuel-powered vehicles.

SRAM is proud to deliver quality, exciting, sustainable products to its customers, but our obligation to social responsibility does not start and end with our products. We are also committed to improving our business practices to increase our positive impact on our employees, the people in our communities and those far away, and our planet itself.

Our purpose statement is “We believe in the power of bicycles and expanding the potential of cycling. We create and manufacture components that inspire cyclists.”

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SRAM Unisex Adult Eagle GX X-Actuation™ Trigger Shifter, Grey, 12 Speeds


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Customer reviews

4.8 out of 5 stars
4.8 out of 5
689 global ratings

Customers say

Customers like the shifting, ease of installation, performance, and quality of the bicycle derailleur. For example, they mention it shifts great, works great on 10 speed cassettes, and is a solid performer. That said, opinions are mixed on fit.

AI-generated from the text of customer reviews

14 customers mention14 positive0 negative

Customers are satisfied with the quality of the bicycle derailleur. They mention that it is a solid performer, impressive, and a good product. Some say that it looks great, feels great, and performs great.

"...My entire drive train is now SRAM.No issues, solid product !" Read more

"...Great derrailleur, buttery smooth, easy to install, comes with the chain gap tool and you can swap the thing real quick...." Read more

"...I love this upgrade for my Shwinn boundry it looks great feels great performs great" Read more

"...regularly hitting rocks in the technical stuff, this is a very good derailleur that doesn’t break the bank every time I break it." Read more

14 customers mention11 positive3 negative

Customers like the shifting performance of the bicycle derailleur. For example, they say it shifts very smoothly, crisp, and clean. Some mention that the shifting between rings is very snappy. Overall, most are happy with the shifting quality of the product.

"...Night and day difference. Shifting is crisp and smooth even under load, and the chain slap is totally gone...." Read more

"...-adjustment with the white tool and the bike set for 30% sag it was shifting perfectly. It's probably the most crucial step...." Read more

"...Shift is great super" Read more

"...Alignment was super simple. Now my bike shifts super smooth all of the time!!" Read more

13 customers mention13 positive0 negative

Customers are satisfied with the value of the bicycle derailleur. They mention that it is worth the money, has a good price, and is a great upgrade over the original SX. Some say that it provides much more positive and reliable shifting than the SX version.

"For me is perfect model. Not to expensive like X01 or XX1 models, and works well." Read more

"...Can't recommend this enough as an upgrade from SX. For a reasonable price it'll make your bike run better than ever...." Read more

"...100% recommended, worth the upgrade 100%." Read more

"Good price, quick shipping. Perfect replacement for a bent or broken one." Read more

8 customers mention8 positive0 negative

Customers are satisfied with the performance of the bicycle derailleur. They mention that it works superbly, and is great on 10 speed cassettes or cogs with more than 40 teeth. Some say that the shifting performance is incomparable.

"For me is perfect model. Not to expensive like X01 or XX1 models, and works well." Read more

"Works great on 10 speed cassettes or cogs with more than 40 teeth." Read more

"The GX derailleur works great on my 2021 Giant Trance X 29 3. It had an SX derailleur 12spd on it and it just wasn't shifting correctly...." Read more

"...Installed all the components and everything works superbly.I had no install issues because I did the necessary research and measurements...." Read more

7 customers mention7 positive0 negative

Customers are satisfied with the smoothness of the bicycle derailleur. They mention that it shifts clean and smoothly, and is super smooth and quiet. Customers also say that there is no longer chatter between rings on the cassette.

"...GX derailleur that I immediately sided with the ones that said It is a smooth, clean, shifting performance incomparable!!!..." Read more

"...Great derrailleur, buttery smooth, easy to install, comes with the chain gap tool and you can swap the thing real quick...." Read more

"It came in the next week it is super smooth super quiet. I love this upgrade for my Shwinn boundry it looks great feels great performs great" Read more

"...Way better grupo than SX. Shifts perfect, stays adjusted AND is quiet." Read more

5 customers mention5 positive0 negative

Customers find the installation process of the bicycle derailleur to be easy.

"...I had no install issues because I did the necessary research and measurements...." Read more

"Easy to install" Read more

"...Great derrailleur, buttery smooth, easy to install, comes with the chain gap tool and you can swap the thing real quick...." Read more

"...it with this GX myself (my first bike mechanic work) and it went on really easy. Alignment was super simple...." Read more

5 customers mention3 positive2 negative

Customers are mixed about the fit of the bicycle derailleur. Some mention that it works perfectly, stays adjusted, and is quiet. However, others say that it didn't sit in there correctly and does not allow proper positioning.

"...Alignment was super simple. Now my bike shifts super smooth all of the time!!" Read more

"...Removing it caused thread damage. This does not allow proper positioning n gears to rub on cassette eventually will destroy more parts on your..." Read more

"...Way better grupo than SX. Shifts perfect, stays adjusted AND is quiet." Read more

"...easily tell the box had been open before & the derailleur wasn't sitting in the box properly...." Read more

4 customers mention0 positive4 negative

Customers are dissatisfied with the durability of the bicycle derailleur. They mention that it lacks durability, breaks easily, and has a flimsy bolt issue. Some say that the pully broke away from the cage and that it bent after a light drop.

"Great upgrade from the NX Eagle, but it lacks durability IMO. Broke my old GX derailur and this one is bent after a light drop on the bike's side...." Read more

"...The thinh just broke after little use and without using it very well...." Read more

"...I liked it at first, shifted clean and smooth. The pully broke away from cage and I know I didn't hit anything. Only lasted a little over 3 months." Read more

"...But the flimsy bolt issue would have left me in the hole $125 had i not drilled room for new B-bolt, for me that's a major design flaw especially..." Read more

Shifts great, "new" product seal was broken and paint was rubbed during shipping
4 Stars
Shifts great, "new" product seal was broken and paint was rubbed during shipping
The GX derailleur works great on my 2021 Giant Trance X 29 3. It had an SX derailleur 12spd on it and it just wasn't shifting correctly. I swapped the shifter and derailleur to GX and even though it has an NX 12 spd cassette which is on an HG hub, it works like it was designed specifically for it! Once I dialed in the B-adjustment with the white tool and the bike set for 30% sag it was shifting perfectly. It's probably the most crucial step. Otherwise you set it up right on the stand and then it shifts poorly once you're in the saddle. A tip on setting your sag, get on the bike and see where the rear shock rests, then take the air out of the shock, use your body weight on the seat to push the bike to that 30% position, hold the white tool with one hand tight against the jockey wheel, and adjust the screw with the other hand. Once those arrows line up it set and you never have to worry about it again. It's much easier to do by yourself than the tutorials make it out to be.Unfortunately someone between the seller and shipping broke the seal on the box. Which sucks because the box doesn't just hold itself closed and the derailleur was just bouncing around in the box rubbing up against the paperwork and the cardboard cover, which took a very small amount of paint off. I know I will damage it much worse some day, but come on, for a new product that is pretty disappointing. Since this was my second attempt at ordering this thing and having to wait for a refund from a product that was stuck in shipping purgatory, I decided to swallow my pride and just use it.It feels very solid, when it shifts it happens quickly and decisively, no more waiting around and listening to the chain grind around. I have ridden around town, but haven't taken it on the trail yet, but so far it seems quieter when dropping off of things
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4.0 out of 5 stars Shifts great, "new" product seal was broken and paint was rubbed during shipping
Reviewed in the United States on August 24, 2023
The GX derailleur works great on my 2021 Giant Trance X 29 3. It had an SX derailleur 12spd on it and it just wasn't shifting correctly. I swapped the shifter and derailleur to GX and even though it has an NX 12 spd cassette which is on an HG hub, it works like it was designed specifically for it! Once I dialed in the B-adjustment with the white tool and the bike set for 30% sag it was shifting perfectly. It's probably the most crucial step. Otherwise you set it up right on the stand and then it shifts poorly once you're in the saddle. A tip on setting your sag, get on the bike and see where the rear shock rests, then take the air out of the shock, use your body weight on the seat to push the bike to that 30% position, hold the white tool with one hand tight against the jockey wheel, and adjust the screw with the other hand. Once those arrows line up it set and you never have to worry about it again. It's much easier to do by yourself than the tutorials make it out to be.

Unfortunately someone between the seller and shipping broke the seal on the box. Which sucks because the box doesn't just hold itself closed and the derailleur was just bouncing around in the box rubbing up against the paperwork and the cardboard cover, which took a very small amount of paint off. I know I will damage it much worse some day, but come on, for a new product that is pretty disappointing. Since this was my second attempt at ordering this thing and having to wait for a refund from a product that was stuck in shipping purgatory, I decided to swallow my pride and just use it.

It feels very solid, when it shifts it happens quickly and decisively, no more waiting around and listening to the chain grind around. I have ridden around town, but haven't taken it on the trail yet, but so far it seems quieter when dropping off of things
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One person found this helpful
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Reviewed in the United States on January 29, 2021
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8 people found this helpful
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Reviewed in the United States on May 16, 2023
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Kevin M.
5.0 out of 5 stars As described, genuine SRAM part
Reviewed in Canada on March 11, 2024
Style: SingleVerified Purchase
Yeoung Omar Nakashima
5.0 out of 5 stars buen producto y el precio muy bueno
Reviewed in Mexico on April 4, 2023
Style: SingleVerified Purchase
Marc M.
5.0 out of 5 stars Lohnt sich!
Reviewed in Germany on March 8, 2024
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villamena gianluca
5.0 out of 5 stars Buon prodotto
Reviewed in Italy on April 25, 2022
Style: SingleVerified Purchase
Christopher Hughes
5.0 out of 5 stars Really good so far - better than the previous version
Reviewed in the United Kingdom on March 18, 2021
Style: SingleVerified Purchase