Sram: We built the incredible new XX1 Eagle™ drivetrain to work quietly, intuitively, precisely and perfectly. This cross-country-optimized drivetrain combines our newest generation of SRAM 1x™ drivetrain technological advancements with lightweight materials. With a greater gear range of 500-percent, XX1 Eagle™ gives you smoother, more precise shifts with greater durability for long lasting performance so you can spend more time in the gear you want. XX1 Eagle™ just rewrote the rules of freedom.Included:• SRAM Rear Derailleur XX1 Eagle 12 speed• SRAM Shifter XX1 Eagle Trigger 12 speed Rear w Discrete Clamp• SRAM Cassette XG-1295 Eagle 10-50 12 speed• SRAM Chain PC X01 Eagle 126 links 12 speed• SRAM Crank XX1 Eagle DUB BOOST 170mm or 175mm• SRAM 34T X-SYNC Direct Mount Chainring• SRAM Chaingap Gauge