OneUp Your Shimano 11 Speed Drivetrain

OneUp your Shimano 11-speed drivetrain with the new 45T sprocket for XT/XTR (M8000/M9000) Cassettes. Get a perfect shifting, truly wide range, Shimano 1x11 setup, with the OneUp 45T expander sprocket and narrow wide chainring.
http://www.pinkbike.com/news/oneup-shimano-11-speed-drivetrain-2015.html