With its beam spider construction, the new Shimano Deore M6100 12-speed cassette shaves weight while increasing Shimano's MTB gearing range another gear. Using Shimano's new Micro Spline freehub body and Hyperglide+ tooth profile, the 10-51T cassette delivers advanced shifting performance. Details: Cassette Cogs: 10-51t: 10-12-14-16-18-21-24-28-33-39-45-51t Compatible Chain: HG 12-Speed Series: Deore Generation: M6100 Number of Speeds: 12 Finish: Anodized Shimano Deore Compatability: The Shimano CS-M6100 cassette is compatible with the following: Chain: Shimano HG 12-speed Derailleur: Shimano 12-speed rear derailleurs Freehub: Shimano Micro Spline freehub body type