SRAM PowerGlide II road cassettes are uniquely designed to provide reliable, accurate shifting over the life of the component. And inspired by racers like Team CSC's Tyler Hamilton, who rode PowerGlide II to a stage win and fourth place overall in the 2003 Tour de France. Type: PowerGlide II. Speed: 9. Option 1: 11 21T, Option 2: 11 23T, Option 3: 12 23T, Option 4: 12 26T. Recommended Chain: PC 990, PC 970, PC 950, PC 89R, PC 89R Hollow Pin. Lock Ring: Shiny Chrome Anodized Aluminum. Finish: Satin Chrome.