Perfect for front single and double MTB drivetrains, SHIMANO's M5100-11cassette offers Rider Tuned gear steps for maximum cadence control across the varied terrain of mountain biking. Available in 11-42t and 11-51t configurations. Details: Cassette Cogs: 11-42t: 11-13-15-17-19-21-24-28-32-37-42t Cassette Cogs: 11-51t: 11-13-15-18-21-24-28-33-39-45-51t Compatible Chain: HG-X11 11-speed Series: Deore Generation: M5100 Number of Speeds: 11 Finish: Plated Compatible Freehub: Shimano HG Shimano Deore Compatibility