The XX SL sits at the top of SRAM's Eagle Transmission cassette hierarchy — this is the flagship, above the XX and X0 T-Type options, and it's where SRAM has pulled every gram they can from the 10-52T range. The construction combines a fully machined, hardened steel X-Dome architecture for gears 1-9 with an ultra-lightweight, all-aluminum Spider Cog for gears 10-12 , which is what separates it from the heavier XX and X0 cassettes that share the same tooth profile and shift ramps.

This cassette only makes sense as part of a complete Eagle Transmission (T-Type) build. The XX Eagle Transmission Cassette and derailleur are engineered as integrated and interdependent transmission components that contact directly, ensuring perfect alignment on every bike . That's why T-Type shifts the way it does under load — the derailleur references off the cassette itself, not off a hanger adjustment. Running this cassette with a non-T-Type derailleur won't work, and the reverse is equally true.

Gearing is the standard T-Type spread: a 520% gear range where the 52-tooth cog steps down with improved gear progression through 44 and 38-tooth cogs in the low end compared to the previous Eagle drivetrain 10-52T cassette . The reworked low-end steps are the practical shift-feel difference between Transmission and the older Eagle mechanical setup — the jumps into the bailout gears are less abrupt. The 55mm chainline compatibility keeps a more moderate chain angle across the range, which translates to longer wear and greater precision .... Read More