12 Speed Drivetrain

Mountain Bikes and Gear
Shimano's Brand New 12-speed Deore XT Mountain Bike Drivetrain, Tested
  19
Mountain Bikes and Gear
Shimano Announces 1x12 drivetrain With New XTR Line
  5
Drivetrain
Review: 400 Miles on SRAM's GX Eagle Drivetrain
  3