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SRAM XG-1299 XX1 Eagle 12-Speed Cassette


Item # SRM009X

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  • Gold, 10-50t ($420.00)
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Item # SRM009X

The Eagle has landed.

In its never ending quest to relegate front derailleurs to plaque-adorned glass cases in buildings we visit to marvel at relics of the past, SRAM pushes one-by into uncharted territory with its revolutionary 12-speed Eagle drivetrain. While the whole group sees engineering taken to new levels of ingenuity, the shining star of Eagle is undoubtedly the SRAM XG-1299 XX1 Eagle 12-Speed Cassette. Resplendent in its gold-plated allure and boasting a massive inner cog that mirrors the size of a compact road crankset's big chainring, this cassette boasts 12 cogs and a 500% usable gear range. This eclipses the popular 10-42t, 420% one-by 11-speed range and rivals the average of 515% found in most doubles.

The Eagle 12-Speed Cassette encompasses that 10-42t cassette so commonly employed with 11-speed one-by drivetrains and adds a 50t bailout cog for those lung-crushing climbs that leave you breathlessly pleading for the cycling deities to fly out of the sky with an extra climbing gear. In short, Eagle gives you a one-by system with all the gear range you need to conquer leg-searing ascents and heart-dropping descents alike, without the finicky weight of a front derailleur or extra chainring.

That glittering gold bling isn't there solely for looks, although we'll readily admit that it'd be worth the investment just to have that golden flash rolling with us off the line. The glitzy aesthetics come courtesy of a Ti Nitride finish that increases durability and reduces friction compared to non-coated cassettes. Ti Nitride does for cassettes what anti-friction coatings have done for suspension forks—makes everything run smoother, quieter, and more reliably over time, so you can focus on the ride without worrying about your drivetrain.

SRAM incorporates its X-Dome architecture, which it perfected with its one-by 11-speed cassettes and yields an open design with an incredibly high strength-to-weight ratio that shoos away mud for confident, consistent shifts in variable conditions. This makes the Eagle 12-Speed Cassette an ideal choice for racers bent on shaving grams without sacrificing durability, along with claims of an even smoother, quieter shifting experience than ever before.

As much as SRAM is reinventing the proverbial wheel with a 12-speed cassette, the company is sensitive to the potential uproar that would greet yet another new hub standard. The Eagle 12-Speed Cassette is designed for compatibility with SRAM's current XD Driver body, making for an easy transition from 11 to 12 speeds. That said, upgrading to Eagle does require a full drivetrain swap, meaning you'll need an Eagle chain, crankset, chainring, and rear derailleur to make use of that 12-speed awesomeness. The good news is that it'll pair perfectly with your current rig that's just waiting to lose a front derailleur or gain a bailout gear on its one-by setup.

  • A 12-speed cassette that redefines 1x drivetrain functionality
  • 500% usable gear range is similar to double drivetrain ranges
  • X-Dome architecture yields incredible strength-to-weight ratio
  • Smoother, quieter shifting characteristics
  • Compatible with SRAM's 11-speed XD Driver body
  • Precision engineered for exceptional longevity
  • Works exclusively with SRAM Eagle drivetrain components

Tech Specs

Cog Sizes:
10 - 50 t
Cog Material:
[cog cluster] CNC-machined cromoly, [50t cog] aluminum
Hub Type:
XD Driver body
Actual Weight:
Gold, 10-50t: 367g
Recommended Use:
cross country
Manufacturer Warranty:
2 years

Reviews & Community


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Avg. ride time: 28m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Keep it 5-Hundo

    This cassette is just what you'd expect from the XX1 designation from Sram, smooth and nearly flawless. Plus it's GOLD! The 500% gear range is perfect for running 1 or 2 chainring sizes bigger than regular 1x11 drivetrains. It took maybe 5-10 minutes of tweaking to dial in the limiter screw and derailleur adjustments, but now I'm shifting 12 gears like a dream! The whole system works very well and I'm very happy with my upgrade. I've used XX1, X01, and XT 11 speed drivetrains. This blows all of them out of the water.

    Gold is pretty sweet

    • Familiarity: I've put it through the wringer

    When color matters go with the xx1 cassette. It is the exact same weight as an xo1 cassette. The only difference it the ti-nitride coating. It will keep your drivetrain quieter and last a bit longer over an xo1 cassette.

    Avg. ride time: 2h 46m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    The best of the best

    • Familiarity: I've put it through the wringer

    I've been riding XX1 eagle for about 1 season now and I have to say it is the best of the best. The dinner plate 50T cog in the back allows you to up your chainring by a couple teeth which makes the gearing that much better on the lower end of the cassette. Some people have had some issues with getting the derailluer dialed in to make the jump from the 42T cog to the 50T but after I played with the b-screw on the derailluer for about 5 minutes, it was running quite smooth. Performance is identical to XX1 1x11 but now you can have blinged out gold in 1x12.

    What you love from XX1 +1 more gear

      I was a little hesitant about why I would need that extra gear range, or what it would do to the shifting mechanics, but after riding this through most of the summer i can say that I ended up using the 50T a lot more than i expected and Eagle feels just like 11sp XX1 with one extra gear. Depending on your terrain, you can increase your chainring size from what you might run to put that extra gear range at the top end rather than low end, but out here in Utah i left a 32t up from and ended up using the 32-50t on really steep grades or after 4-5 hours in the saddle when the legs arent nearly as spry. Set up was a little bit trickier as the tolerances are naturally tighter, but wasnt too bad. Once set up I had no real issues. Eagle delivers the crisp 1:1 sram shifting that you'd expect.

      What you love from XX1 +1 more gear

      Not as I expected

      • Familiarity: I've used it several times

      The perfomance isn't as I expected, the drivetrain is not that precise in the higher plate (50t)

      Maybe you had a chipper bike. O terrible adjustment. For my s-work specialized work great!😉

      Deivi Villegas
      2017 Santa Cruz Tallboy CC Isn't that chip, The gear was Installed by a professional, maybe you're noob or are using it just for sunday rides

      Sounds like you need to adjust your limiter screw. Works awesome on my Sworks enduro. 300 miles in the last 3 months before winter hit.

      Can I use my Sram XX1 cranks with the rest of parts of XX1 eagle groupset?

      Sure Jorge, no problem, besides you can use the new Eagle Chainring in your XX1 Carnkarms

      World Champ

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

      Riders from the Sram pro teams have been testing the Eagle drivetrain in a variety of conditions. A lot of blood, sweat, and gears have gone into its development and what has come out is nothing short of impressive. The engineering of each piece of the drive train has allowed riders to benefit in a number of ways and it is no surprise to see the signature gold Ti-nitride gracing podiums from the US to Nove Mesto.
      If the pros can use a bail out gear, so can the rest of us. The Eagle 12-speed cassette allows for a massive range and can be paired with a variety of different Eagle Chain rings to optimized gear ratios based on your chosen terrain. Shifting is as silky smooth and exact as ever and the new Eagle chain is manufactured through an exhaustive 37-step process to ensure precision. When you put this group on your bike, be ready to blow the doors off your competition, even if its just yourself.
      Feel free to contact me directly for your next build or to upgrade your existing drivetrain.
      My Schedule is as follows:
      Mon-Thurs: 7am-530pm
      I can be reached at, on Chat as Sean Z, or by phone at 801-736-6396 x 4739

      World Champ