TheShimano Ultegra CS-6800 11 Speed Cassette is the ideal addition to any serious road riders kit, producing a flawless shifting action time after time the performance put in by the Ultegra Cassette is nothing short of astounding! With the new model the 6800 brings several key improvements from previous renditions, including Hyperglide EV sprockets which help reduce the overall weight while simultaneously creating a more accurate shifting experience thanks to the new teeth shaping! The wide gear range that comes included with theShimano Ultegra CS-6800 11 Speed Cassette ensures that it appeals to riders of all styles, ensuring that when you purchase this high performance Cassette you will not be left wanting more! Shimano Ultegra CS-6800 11 Speed Cassette Features Lightweight 11-speed HG-EV cassette with rigid alloy sprocket carrier for reduced weight and better shifting performance, even under the most demanding gear changes Hyperglide EV sprockets have been designed to reduce weight with improve teeth shaping providing accurate shifting and reduced wear Wide gear range to meet the demands of all types of rider For use with HG-EV chains