With its Beam Spider construction, the Shimano Deore M6100 12-speed cassette shaves weight while increasing Shimano's MTB gearing range another gear. Using Shimano's Micro Spline freehub body and Hyperglide+ tooth profile, the 10-51T cassette delivers advanced shifting performance.   Features Trickle down technologies at its best. Hyperglide+ provides fast and smooth shifting. Beam Spider construction cuts weights and boosts stiffness. Micro Spline fitment. 10-51T wide range 12-speed gear combination.