Eagle AXS is the name of SRAM’s new 1x12-speed, wireless electronic mountain bike derailleur and shifter—part of SRAM’s larger rollout of the AXS ecosystem of components that includes the new Red eTap AXS drivetrain and the RockShox Reverb AXS dropper post. All AXS parts can talk to each other, which makes a number of interesting bike builds possible.

Reduced to its most basic level, the Eagle AXS rear derailleur simply uses a motor, instead of a cable, to move the derailleur.

Of course, there’s a lot more to it than that. SRAM’s wireless electronic mountain bike drivetrain has been in development for more than six years. SRAM’s engineers started the project about the same they began developing Eagle, the latter of which they prioritized, pushing development of the electronic drivetrain to the back burner. Once they brought Eagle to market, they moved the electronic system back to the top of their to-do list.

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