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: choose; 10-45t, or 10-51t. Compatible Chain: HG 12-speed. Weight: 461g. (10-45T), 470g. (10-51T).
