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SRAM XG-1275 GX Eagle 12-Speed Cassette

Item # SRM00C9

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  • Black, 10-50t ($195.00)
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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 Specs

Cog Sizes:
10 - 50t
Cog Material:
[10-42t cogs] stamped steel, [50t cog] aluminum
Hub Type:
Claimed Weight:
Recommended Use:
mountain bike
Manufacturer Warranty:
2 years

Reviews & Community


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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.


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

Purchased this with the help of Kyle @ Backcountry. I wanted as much bang for the buck as possible with a mid-level priced Eagle setup. The GX cassette was the obvious choice and I paired it with a X01 rear derailleur, a GX shifter and a X01 chain. 100% compatibility amongst the components I chose. Installation was a snap and I was out riding this morning. What a difference it made on my SC Hightower. I had previously converted to SRAM X1 cranks and a XSync 2/Eagle chainring so the upgrade was a no brainer. I reccomend any of the SRAM Eagle components from any of the trim levels. You'd be hard pressed to choose wrong.

Unanswered Question
Avg. ride time: 8h 13m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

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