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  • SRAM GX Eagle 12-Speed Rear Derailleur
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SRAMGX Eagle 12-Speed Rear Derailleur

Item # SRM00C7

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  • Black, One Size ($125.00)
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Item # SRM00C7

Symphonic 12-speed shifting.

The SRAM GX Eagle 12-Speed Rear Derailleur harmoniously shifts through all 12 gears of your Eagle drivetrain without noisy chain slap or annoying ghost shifts holding you back on the trail. Borrowing shifting technologies from its pricier XO1 sibling, the GX Eagle 12-Speed Rear Derailleur is a low-cost alternative that retains SRAM's X-Sync 14-tooth lower pulley system, X-Horizon parallelogram design, and Type 3 Roller Bearing Clutch. Best of all, it's fully compatible with Eagle XO1 and XX1 drivetrains, giving you an affordable replacement in case of a catastrophic crash.

Instead of its forged aluminum cage and titanium spring found on the XO1, the GX 12-Speed Rear Derailleur employs a traditional aluminum cage with steel spring as a cost-conscious alternative without sacrificing durability, albeit with a minor weight penalty. Expanding on SRAM's signature technologies, the X-Sync 14-tooth lower pulley accommodates the larger 10 to 50-tooth cassette found on Eagle. For silent operation, the Type-3 Roller Bearing Clutch eliminates derailleur bounce and chain slap when you're rallying over punishing trails. Also, it packs SRAM's X-Horizon design, which limits horizontal derailleur movement that contributes to ghost shifting, as well as X-Actuation for precise shifts of your 1x drivetrain.

  • Budget-friendly rear derailleur for Eagle drivetrains
  • Compatible with all Eagle 1x12 drivetrains: GX, XO1, XX1
  • Traditional aluminum cage and steel spring maintain durability
  • Type-3 Roller Bearing Clutch eliminates noisy bounce and slap
  • X-Sync 14-tooth lower pulley accommodates larger Eagle cassette
  • X-Horizon design limits horizontal movement that causes ghost shifts
  • X-Actuation makes for quick, precise shifts of your 1x drivetrain
Tech SpecsWeight
Tech Specs
[cage] aluminum, [pulley, spring] steel
Pull Type
Cage Length
Cassette Range
10 - 50t
Eagle GX, Eagle XO1, Eagle XX1
Recommended Use
mountain bike
Manufacturer Warranty
2 years

Actual Weight

Actual weights are measured in-house by the Competitive Cyclist team.

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Black, One Size

Claimed Weight

Claimed weights are provided by the vendor.

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Reviews & Community


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Great Value

  • Familiarity: I've used it several times

Great derailleur and just as good as the higher end x01/xx1, but a lot cheaper (will be less painful to replace when you smash it on a rock).

Just what I wanted

  • Familiarity: I've used it several times

Works will with the eagle setup. The cage arm is long so it makes me nervous about hitting on rocks SRAM GX Eagle 12-Speed Trigger Shifter Black, Rear - SRM00C5-BK-REAor getting branches tangled in it but I guess it is a necessity for such a wide gear ratio.

Solid Performer

  • Familiarity: I've put it through the wringer

Solid performance, excellent range, and at a great price! There literally is nothing to not like about this derailleur. I have always been a big fan of SRAM's "set it and forget it" reliability and this component is no exception. I've had this RD on my bike for about a year and have literally not touched it since the bike was new. Despite that, the RD shifts crisp and true.

Best bang for your buck MTB drivetrain

  • Familiarity: I've put it through the wringer

If you are looking at upgrading to Eagle and confused about all the different models, let me break it down for you. XX1 Eagle is the top of the line with a hollow pin chain and single piece milled Cromoly cassette. X01 saves about two Benjamins and is functionality the same except for weighing 40g more than the XX1. The GX eagle cuts some corners, using a standard chain design and the cassette is stamped and riveted like a normal cassette instead of milled.
FUNCTIONALLY THE GX EAGLE IS THE SAME AS THE XX1 AND X01. I cannot stress this enough. The only reason to go with the X01 or XX1 over the GX eagle is if you are an super extreme XC rider trying to save every gram or just really like gold and willing to drop and extra grand. With that cleared up, onto the review.
The Sram GX eagle is surprisingly straightforward to install. Sram has a fantastic video that breaks down the installation and adjustment to a 10 minute video. With the proper tools it took me an hour, included the time it took to install the XD driver. But if your bike already has an XD driver, installation is a breeze.
The smoothest shifting I have ever had the pleasure of using. With every gear change the chain seems to lock perfectly into the next chainring, even when downshifting 5 or 6 gears at once. With the narrow wide design being utilized on the jockey wheel as well as front chaining, I have had no issue with the chain slipping or coming off, even after testing it off some intense drops on a hardtail. The clutch keeps the chain very taught and prevents it from slapping around on rocky sections.
Overall the best drivetrain for the dollar right now. The only complaint I have about the GX groupset is I am not a fan of the front chainring mounting design on the new cranks. Save some money and use your old cranks and just purchase the drivetrain. I'll take my old XTR four bolt cranks with a Raceface chainring over the Xsync design anyday.

Rad Groupset Rad Price

  • Familiarity: I've used it several times

Just bought a full GX groupset for my bike, and the whole thing performs perfectly. Sure it is not as light as the higher end options but it works so well and you can not beat the price.

Amazing performance

  • Familiarity: I've used it several times

Hard to believe the XX1 is better, specially considering the price difference


  • Familiarity: I've used it several times

I am not a fan of the first line of tech specs saying budget friendly rear derailleur. Sure, it is, but the quality is there as well. Why pay so much extra for XX1 when you can get such great quality for a lower price. Sure, you add a little weight with this set, but if you aren't an XC maestro, a little extra weight never really hurts, does it?

Best derailleur for the money

  • Familiarity: I've put it through the wringer

Throughout the year I have the privilege of riding a lot of different bikes. I have ridden bikes equipped with Shimano SLX, XT, XTR as well as bikes fitted with SRAM GX, X01, and XX1 Eagle. Though all of these drivetrains are awesome GX Eagle stands out as the working man's hero. Compared to X01 and XX1 Eagle, GX Eagle offers nearly as refined of a shift feel. GX Eagle does have a slight weight penalty compared to its more expensive siblings but you save a ton of money compared to those more premium offerings. Bang for your buck I believe GX Eagle is the best drivetrain on the market. I highly recommend this rear derailleur if you want smooth shifting and a huge range.

Go 12 speeds

  • Familiarity: I've put it through the wringer

The GX eagle has arrived and this 12 speed derailleur will keep things running smooth.

Best Bag for the buck

    Such a good deal. shifts better then XX Eagle and at a way better price. just a little bit more weight

    The everyman's 12speed

    • Familiarity: I've used it several times

    Got it in a GX eagle group. Setup straighforward. And it works like its more expensive stable mates. No excuses for 12-speed wide range upgrade now that GX eagle is widely available.

    GX = "Goodbye XT"

    • Familiarity: I've used it several times

    Some might consider SRAM's Eagle GX to be a 3rd tier groupo behind XX1 and X01. I'd agree with SRAM in saying XX1 and X01 are equals, with X01 being all mtn focused, and XX1 more XC focused. That leaves GX Eagle in the next tier down, and I believe in line with Shimano's competing XT level of components. All that said, GX is better than XT, better range, better shifting under load, quicker feeling shifting actuation, and probably better weight. I've got Eagle GX on one bike, and X01 Eagle on another, and aside from the shift lever clocking, I can't tell a difference in performance between the two. If you're not counting grams, go Eagle GX.

    Eagle GX

    • Familiarity: I've used it several times

    Fantastic system, incredible range, plan to switch to 1x12 on two other geared bikes.

    Eagle GX

    GX eagle works great!

    • Familiarity: I've used it several times

    I love this stuff. Pricing is fantastic, so when you inevitably break or bend a derailleur, you won't have to take out a second mortgage on your home to afford a replacement. Shifting feels snappy and crisp, and I have had no ghost shifting or similar issues. Well done SRAM!

    Quick, quiet and ground-breaking

    • Familiarity: I've put it through the wringer

    The GX Eagle gear is SO nice! I thought for sure trying to do another gear would result in loose chain tension, noise or at a minimum extra tuning work. None of those happened. This has been GREAT and makes the move to 1x drivetrain so much easier to deal with. Super happy with this purchase!