From the toughest World Cup courses to the smoothest bike paths, SRAMR PowerGlide II cassettes bring the right combination lightweight materials, durable construction and precise engineering to the ride. Get the same reliable, lightweight performance BlackBox racers enjoy. Keeps the shifting smooth and easy on pavement or singletrack. SRAMR PowerGlide II 8 speed cassettes give you reliable performance, day in and day out. The race proven design and durable, chrome plated finish help ensure years of hassle free performance. Option 1:: 11 32T, Option 2:: 11 28T. Recommended Chain:: PC 38. Lock Ring:: Steel. Finish:: Chrome Plated.