Without much fanfare, SRAM has completely revamped its classic Eagle drivetrains. The new Eagle S-Series replaces a wide range of previous groupsets—including GX, X01, and XX1—with just three lines: S100, S200, and S500. The goal is to significantly simplify the product lineup and make it easier to select and replace components. 

Technically, the S-Series deliberately remains within the familiar Eagle ecosystem: All systems continue to rely on conventional 1x12 drivetrains with standard chains and classic derailleur hanger mounting—meaning they explicitly do not use the new T-Type Transmission system. At the same time, backward compatibility with existing Eagle components is maintained, which simplifies upgrades and spare parts procurement. 

The three tiers cater to different needs: the S100 as a robust and price-conscious entry-level option, the S200 as a mechanical mid-range solution, and the S500 as the top-of-the-line model with AXS electronics. Among the new features is a so-called half-mount design on the S100 rear derailleur, which is intended to improve stability during lateral impacts. 

With the Eagle S-Series, SRAM is responding to the continued widespread use of classic Eagle drivetrains and creating a clearly structured platform for bikes without a Transmission Interface—both in the OE sector and in the aftermarket. For fans of the GX, X01, or XX1 groupsets, it’s time to say goodbye—or stock up on a few spare parts. 

sram.com