Shimano XTR CS M9000 11 Speed Cassette. While your rhythm on the dance floor may garner torrents of laughter, out on the trail your rhythm over the hills and dales of your favorite singletrack will be absolutely spot on and impeccable courtesy of the new Shimano XTR 9000 11 speed cassette. The widest range cassette Shimano has ever produced 11 to 40T over its 11 speed range is also its most balanced. Thanks to its rhythm step progression, it maintains calculated, shock free gear steps from one gear to the next, saving you precious energy. And of course, new XTR being new XTR, its shifting performance is otherworldly and the combination of steel, titanium, and aluminum teeth coupled with a carbon spider keep the gram count impressively low.