The Shimano Ultegra CS-R8100 12-Speed Cassette is a lightweight 12-speed HG+ cassette with a rigid alloy sprocket carrier for reduced weight and better shifting performance, even under the most demanding gear changes.Shimano Ultegra CS-R8100 12-Speed Cassette FeaturesHyperglide+ sprockets have been designed to reduce weight with improve teeth shaping providing accurate shifting and reduced wearWide gear range to meet the demands of all types of riderFor use with 12-Speed chains
Best Price: £119.99 from Leisure Lakes Bikes