Shimano Dura Ace R9200 12 Speed Cassette

Blacks

Super lightweight 12speed HG+ cassette with a rigid carbon and alloy carrier for excellent shifting even under the most demanding gear changes.Key Features:Hyperglide+ sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under loadClose ratio gearing allows a more efficient use of energy through finer cadence controlLargest sprockets are mounted on lightweight alloy and carbon carriers to reduce weight and increase rigidity5 largest sprockets are made from titanium to reduce weight without sacrificing strengthSprockets are extensively cut away and drilled to further reduce weight without reducing rigidityNickel-plated finish offers hard wearing resistance to corrosionAlloy cassette lockringFor Super Narrow 12-speed chains

Amazon

Faster, seamless shifts under maximum pedaling load Version: 11-30 Provides peak efficiency and accelerating performance for every situation Durable and reliable construction Provides smooth and precise shifting Refined 12 step gear combination