Behold the new 2017 sram eagle 1x drivetrains eagle drivetrains provide unparralled performance enhanced toughness and durabilty and the freedom of 500 percent gear range sram introduced the first ever purpose built 1x drivetrain and is the absolute leader in 1x technology and innovation wehave manufactured tested and ridden hundreds of thousands of sram 1x drivetrains and have capitalized on the lessons learned from our experience to create all new drivetrains with eagle tec