Shimano CS-6800 Ultegra 11-speed cassette 1 2-25T. This is a lightweight 11-speed cassette for Ultegra Drivetrains. Shimano Ultegra equipment is the choice many serious road cyclists as it gives you near pro levels of performance but at a much more affordable price point. The CS-6800 Cassette has Hyperglide EV sprockets which are designed to be lightweight, smooth shifting & hard wearing. Basically everything you want in a cassette. Features Lightweight 11-speed HG-EV cassette with rigid alloy sprocket carrier for reduced weight & 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 & reduced wear Wide gear range to meet the demands of all types of rider For use with HG-EV chains