Paired with the Shimano HYPERGLIDE (HG) chains, HG cassette sprockets deliver a fast and precise index shifting action. The computer-designed sprockets incorporate specifically positioned shift ramps and tooth profiles for improved chain control during shifting. Responsive, smooth and low-noise shifting is the result 1N** m-*1509975(200-205)10/5 1/6(10 1/13(30 1/13:4 3/25(30:4/1eta 1509115 1509200a 22222prebook(30:6/15 92622(5:1:9/30/22:ari----2:10/4/22:ari----2:10/7/22:ari