The front derailleur is dead. Well, with SRAM Eagle, it is. One quick look at the X-DOME™ Eagle™ cassette and any last dangling shred of an argument in favor of a mountain bike front derailleur is now officially done. Designed to be used with SRAM’s proven, and reliable XD™ Driver Body, this 12-speed, 10- to 50-tooth cassette offers an optimal 500-percent gear range at a considerably lighter weight than 2x systems. It carries with it the X-DOME™ architecture, which, independent tests have concluded, yields the strongest cassettes on the market. Shifting characteristics improve both, inboard and outboard shifting, as well as chain retention.