System engineered for use with the SHIMANO ULTEGRA R8000 groupset the R8000 cassette is available in a wide range of road and mixed surface ratios. It is compatible with HG-EV and HG-X11 chains. 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 11-speed HG-EV chains