• New shift ramp designs provide the fastest, smoothest shifts by HYPERGLIDE+
• Lighter and stiffer construction
• Reduces cassette inertia resulting in faster acceleration and increased chain security
• 10T lowest sprocket realized by new FREEHUB body construction
• Definitive shifting performance
• Cassette/Driver Compatibility: Shimano MICRO SPLINE
• Wide range and close step 12-speed drivetrain
• Combination: 10-51t
• Compatible Chain: HG 12-speed
• Weight: 470g. (10-51T)

Note: New Unused Ex-Shop Stock so Slightly Shop-Soiled Retail Packaging...