Shimano Ultegra CS-R8000 Cassette Gray, 11x25

What Our Gearhead(R) Experts Are Saying: "The CS-R8000 shifts as smooth as Dura-Ace but saves you some serious cash. It's durable, quiet, and gives you all the range you need for everything from steep climbs to flat-out crits." When precision and dependability matter most, the Shimano Ultegra CS-R8000 Cassette gives us the same crisp, reliable shifting found in the brand's top-tier drivetrains-without the premium price tag. Designed for riders who demand performance across every terrain, it offers a wide range of gearing options suited for racing, training, or tackling long climbs. Each cog is nickel-plated steel for durability and smooth transitions, mounted on a lightweight aluminum carrier to keep the weight down. Whether we're grinding up alpine passes or sprinting for the line, the R8000's perfectly tuned shift ramps deliver that signature Shimano feel-quiet, precise, and utterly reliable mile after mile.