OCT20 Coupon—Save 20% on One Full Priced Item (Exclusions Apply) »

SRAM XG-1299 XX1 Eagle 12-Speed Cassette


Item # SRM009X

Select options
  • Select options
  • Gold, 10-50t ($420.00)
  • 100% Guaranteed Returns
  • Free Shipping on orders over $50

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
Claimed Weight:
352 g
Recommended Use:
cross country
Manufacturer Warranty:
2 years

Reviews & Community


Write a review

    Add a:
  • Photos
  • Videos

No file chosen

Rather attach a photo from your computer?


Only jpg, jpeg, png, gif or bmp files please.

Submit ReviewCancel

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

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 swall@backcountry.com, on Chat as Sean Z, or by phone at 801-736-6396 x 4739

World Champ