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XG-1275 GX Eagle 12-Speed Cassette

Item # SRM00C9

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  • Black, 10-50t ($215.00)
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Item # SRM00C9

Eagle at a palatable price.

When SRAM's one-by-twelve Eagle drivetrain was initially released, it marked an evolutionary step in the company's determination towards ditching the front derailleur for good. However, this massive range of usable gears came with a price tag that's out of reach for the vast majority of trail riders. Determined to give these riders the 500% gear range of pricier Eagle XO1 and XX1 Cassettes at an upgrade-friendly price, SRAM engineered the XG-1275 GX Eagle 12-Speed Cassette to be reliable and smooth shifting, albeit with a 93 gram weight penalty over the XO1 Eagle Cassette.

To keep production costs down, SRAM employs Full Pin technology for the first 11 cogs. This production method places stamped steel cogs together with stainless steel pins, instead of the CNC-machined chromoly cluster of the XO1 Eagle Cassette. It still retains the aluminum 50-tooth cog of the XO1 Eagle Cassette for weight savings, seeing it's the largest cog on the cassette. Ultimately, this production method creates a cassette that's relatively lightweight and incredibly tough—all while saving hard-earned loot for future bike upgrades and trips to riding destinations.

SRAM incorporates X-Glide 2 architecture into the XG Eagle Cassette for improved inboard and outboard shifting, as well as better chain retention, seeing it's a one-by system. This architecture is especially noticeable when you're spinning up steep climbs in the largest cogs by keeping the chain from flopping off. And because it's designed to seamlessly work with all Eagle 1x12 drivetrains (including XO1 and XX1), this 12-speed cassette is compatible with SRAM's current XD Driver body.

  • Cost-conscious version of Eagle 10-50t cassette
  • Massive 500% gear range at an attractive price
  • Compatible with Eagle 1x12 drivetrains: GX, XO1, XX1
  • Full Pin tech keeps costs down while maintaining strength
  • X-Glide 2 design for improved shifting and chain retention
  • Compatible with SRAM's current XD Driver body
Tech SpecsWeight
Tech Specs
Cog Sizes
10 - 50t
Cog Material
[10-42t cogs] stamped steel, [50t cog] aluminum
Hub Type
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, 10-50t

Claimed Weight

Claimed weights are provided by the vendor.

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Reviews & Community


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Dinner Plate Fun

  • Familiarity: I've put it through the wringer

The giant 50t cassette is as functional as it is gorgeous. I've had to use the 50t several times to bail myself out of steep climbs and every time I am super grateful it's there. 10/10 would buy again.

GX is great

  • Familiarity: I've used it several times

Unless you want to save some grams go GX. Works flawlessly every time. Use the money you save to spend it where it counts - wheels, suspension, coaching or buying friends with post ride snacks! This may actually be the one area to consider an up grade... It does work super well but this is the chunkiest component in the groupset - look at the Xo1 or the Ethirteen 12 speed cassette.

More range for a great price

  • Familiarity: I've put it through the wringer

This is a great cassette if you are going 1x12 becaua the range is the best on the market. This range allows you to ride everything from technical almost straight up hill to full on DH lift assisted riding. The best range for the price out there!

The eagle has landed!

  • Familiarity: I've put it through the wringer

A few year back when Sram turned their cassettes up to 11 I was in love with the simplicity and pretty happy with the range. Sram went and out did themselves this time, turning it up to 12, increasing the gear range, and making the shifting even more butter (even in the rain!). If you want the ultimate 1x set-up look now further than Sram Eagle

Very Satisfied

  • Familiarity: I've used it once or twice and have initial impressions

Moved from a 2x10 to this 1x12 setup. Happy to not deal with the front derailleur anymore. The jump on the last gear is huge 42-50, would have been nicer if it were a smaller jump. On my 2x10 setup I rarely used the granny gear but on the new setup I’m having to use it more than I like, that of course also depends on your choice of chainring also, I went with 32 oval on hindsight I should have gone with a 30 or 28 oval.

Also the shifting in more noisier than my Shimano XT.

Very happy with the setup despite the highlighted shortcomings.

If your shifting is more noisy than XT, you might want to check your adjustments. I'm a huge XT fan and recently put eagle on a bike and it shifts much quieter/smoother. Not that it matters for riding enjoyment, but I disagree that it is noisier.

12-Speeds, Lower Price

  • Familiarity: I've put it through the wringer

As with the rest of the group, the GX Eagle Cassette exemplifies trickle down at its best. Performance & price definitely meet in the middle with this cassette. The fact that SRAM gives all Eagle components the same range and compatibility is sheer genius.

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.

Great if you don't care about the weight

  • Familiarity: I've used it several times

It performs great, and the range of gears is amazing.
But if you do care about the weight, look for a X01 or XX1 cassette

50t FTW

  • Familiarity: I've used it several times

Seriously, climbing steep hills has never been easier with this 12 speed, 50t bail out ring. Get you some and start climbing like a mountain goat!

Go 12 speeds

  • Familiarity: I've put it through the wringer

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

Same function, heavier; more durable?

  • Familiarity: I've used it several times

as far as I can tell, this is the big difference in GX Eagle and its pricier siblings... All steel means more weight than machined aluminum alloy but also likely means more durable. If you're a gram counter, look at the X_ eagle stuff. If you're a dollar counter, look no further.

Affordable Eagle cassette

  • Familiarity: I've put it through the wringer

I replaced my XO1 Eagle cassette with this GX Eagle cassette to save some money. There is a 100g weight penalty but as Jon J. says below I haven't noticed any difference in performance. That being said I am using this cassette with an XO1 Eagle shifter and derailleur.

Extend your money and range.

  • Familiarity: I've used it several times

If you're not counting grams, the GX cassette is the 12spd option to go with. A 100g weight penalty over the X01 Eagle cassette, but $170 bucks less. I've got one bike with GX, and another with X01, and performance in equal in my experience.

Bringing eagle to the masses

  • Familiarity: I've used it several times

This brings down the admittedly high price of eagle cassettes to a more approachable level, while maintaining a weight that is still lighter than competitors. Pair it with an Eagle chain, and the shifts are smooth, crisp, and precise. Highly recommended.

Can I replace my current XX1 1 x 11 casette with the 12?

Hey William - unfortunately, you'll need more than the cassette to take advantage of the 1x12 system, as your rear derailleur, shifter

and chain won't be compatible. It's my understanding that while the new Eagle chainring is recommended, it's not mandatory like the parts above.

Unanswered Question

Alright, so question is, can this be applied to a gravel setup. Eagle cassette, eagle rear derailleur with Sram force 1 shifters