The shimano 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 t