Shimano XTR Cassette Sprocket CS-M9001 11-40T

Rhythm is the essence of smooth power transfer and a proper gear step is the key to maintaining rhythm over varied terrain. The CS-M9001 11-speed 11-40T cassette is the widest range cassette Shimano has ever produced and also the most balanced. Thanks to its "rhythm step" progression it maintains calculated, shock-free gear steps from one gear to the next, saving riders energy and helping maintain their flow on the trail.