Shimano M771 XT 10 Speed Cassette Shimano's new XT-level 10-speed cassette specifically designed to work with a 10 speed drivetrain. Shimano developed Dyna-Sys with the goal of increasing rider efficiency. This means closer ratios, smoother shifts, and a more stable pedal stroke. Uses a two-spider construction on the largest six cogs for lightness and rigidity, and prevents gouging of aluminum freehub bodies Lightweight Alloy Lockring Dyna-Sys 10 speed Compatible with 8/9/10/11 speed freehub bodies Use with Shimano 10-speed MTB chains Weights: 11-32T: 280g 11-34T: 309g 11-36T: 330g | Shimano XT CS-M771 10 Speed Cassette 11-32T, 10 Speed