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