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The front derailleur is dead. Well, with SRAM Eagle, it is. One quick look at the Eagle™ cassette and any last dangling shred of an argument in favor of a mountain bike front derailleur is now officially done. The NX cassette gives riders every bit of the climbing range that the Eagle™ ecosystem affords with a simple upgrade to splined-drive body wheels. This 12-speed, 11- to 50-tooth cassette offers an optimal 500-percent gear range at a considerably lighter weight than 2x systems. Thanks to an optimal tooth profile and updated shift ramps, shifting remains quick, crisp and responsive- use it. 

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