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SRAM XS-1299 XX SL Eagle Transmission 12-Speed Cassette
May 7, 2026MPN: 00.2418.124.000
$660.00
SRAM’s top-of-the-line Transmission cassette with a 520% gear range
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SRAM XS-1299 XX SL Eagle Transmission 12-Speed Cassette
The SRAM XS-1299 XX SL Eagle Transmission 12-Speed Cassette features an all-new full X-SYNC design which means the harder you pedal, the better it shifts! In addition, it features a fully machined, hardened steel X-Dome architecture for gears 1-9 and an ultra-lightweight, all-aluminum Spider Cog for gears 10-12. This makes it ultra-lightweight and strong. In fact, it’s SRAM’s lightest ever Eagle cassette!
The SRAM XS-1299 Eagle XX SL cassette and derailleur also contact directly, which ensures perfect alignment on every ride. You also get a massive 520% gear range and the 52 tooth cog steps down with improved gear progression with 44 and 38 tooth cogs in the low end.
SRAM MTB Cassette Comparison
| Model | Price | Speeds | Color(s) | Gearing | Chain Compatibility |
| SRAM XS-1295 X0 Eagle T-Type 12-Speed Cassette | $440 | 12-Speed | Dark Polar | 10-52T | T-Type |
| SRAM XG-1299 Eagle 12-Speed Cassette | $545 | 12-Speed | Rainbow | Gold | 10-52T | Eagle |
| SRAM XS-1297 XX Eagle T-Type 12-Speed Cassette | $605 | 12-Speed | Silver | 10-52T | T-Type |
| SRAM XS-1299 XX SL Eagle T-Type 12-Speed Cassette | $660 | 12-Speed | Silver | 10-52T | T-Type |
Compatibility
Compatible with SRAM T-Type 12-speed MTB drivetrains and made to work with an XD driver body.
Specs
- Speeds: 12s T-Type
- Gearing: 10-52T
- Finish: Black
- Technology: XS
- Weight: 350 grams
- Cogs: 10-12-14-16-18-21-24-28-32-38-44-52
Tools Needed for Installation
You will need the following tools for installation of this product. You can shop for the required tools on our Tools Page.
- Cassette lockring tool like the PRO Team Lockring Tool or Unior SRAM/Shimano Cassette Lockring Tool
- Chain whip like the Wolf Tooth Chain Whip
Q&A
Have a question about this? Ask the staff.
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SRAM's lightest Eagle T-Type flattop chain -
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SRAM XX SL Eagle Transmission Direct Mount ChainringPrice range: $84.00 through $140.00Super light 8-bolt chainring for SRAM XX and X0 Eagle AXS T-Type cranksets
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SRAM XX SL Eagle AXS Transmission Rear DerailleurOriginal price was: $715.00.$645.00Current price is: $645.00.Hangerless Interface, AXS pairing and full carbon cage
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