Sram Eagle XX SL XS-1299 T-Type Cassette - 12 Speed - 10-52T

The XX SL Eagle Transmission (T-Type) Cassette provides exceptional shifting performance under loa...

Best current price£549.00from Merlin Cycles

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Merlin CyclesSram Black Eagle Xx Sl Xs-1299 T-Type Cassette - 12 Speed - / 10-52 / 12 Speed / Xd Drive
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£549.00
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TredzSram 1299 Xxsl T-Type Eagle 10-52 12 Speed Cassette Size 10
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£579.99
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Product Information

Full details

The Sram Eagle XX SL XS-1299 T-Type Cassette is designed for elite mountain bikers and racers who demand the lightest weight and most precise shifting performance available for their drivetrain. By utilizing a full X-Sync design and a hardened steel X-Dome architecture, it provides seamless gear changes even under intense pedal load. While it offers unparalleled efficiency and a massive 520% gear range, users must ensure their bike frame and derailleur are specifically compatible with the T-Type system and a 55mm chainline.

All features

Model Part NumberFW8124000
BrandSram

Extended Product Information

FAQs

Is this cassette compatible with non-T-Type derailleurs?

No, the XS-1299 is specifically engineered to function as part of the Eagle Transmission ecosystem.

Does this cassette require a special tool for installation?

It requires a standard cassette lockring tool compatible with Sram XD cassettes.

What is the gear range on this cassette?

The cassette features a 10-52T range, providing a 520% gear ratio.

Can I use this with an HG or MicroSpline freehub?

No, this cassette is strictly for use with the Sram XD driver body standard.

What chain should I use with this cassette?

You should use a Sram Flattop T-Type chain designed for the Eagle Transmission system.

Troubleshooting

Shifting feels hesitant or rough under load

Verify that your derailleur hanger is properly aligned and that you are using a T-Type compatible chain and derailleur.

Cassette does not seat correctly on the freehub

Ensure your hub is equipped with a standard XD driver body and that the lockring is tightened to the recommended torque specification.

Difficulty reaching the largest cog

Re-check your B-gap and indexing using the integrated Setup Cog to ensure the derailleur is positioned correctly relative to the 52T cog.

Pros and Cons

Pros

  • Extremely lightweight design for competitive racing
  • Flawless shifting performance while under heavy pedal load
  • Optimized gear progression for smooth transitions
  • Durable hardened steel construction
  • Easy installation with dedicated setup cog

Cons

  • Requires T-Type compatible derailleur
  • Limited to 55mm chainline configurations
  • Significant investment compared to non-SL models

Setup, Compatibility & Care

This cassette requires a standard XD driver body for mounting. Before installation, confirm your bike frame supports the 55mm chainline standard necessary for the Eagle Transmission ecosystem. When installing, use the integrated Setup Cog to align your T-Type derailleur to the manufacturer's specifications. For maintenance, keep the cassette free of excess debris and ensure your chain is properly lubricated to maintain the performance of the X-SYNC interface. Avoid using caustic cleaning agents that could strip the finish on the aluminum Spider Cog.

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