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Shimanos Ultegra group is one of the most popular out there with good reason: its the perennial favorite when you factor the performance-to-dollars equation. With different demands for drivetrain ranges required for road gravel and CX riding Shimano has created cassette ranges designed to allow the R8000 drivetrain to easily satisfy the needs for a variety of riders. The Ultegra CS-R8000 Cassette ranges as high as 32t so you can set up the new Ultegra or Dura-Ace R9100 with the range you need for gravel epics 4 corner crits hill climbs junior nationals and everything in-between. Shimanos experience in forging machining and engineering allows for an enormous amount of technology that goes into tooth design shaping and shifting ramps. The cogs themselves are constructed from a nickel-plated steel that prevents corrosion and is slow to wear. Ultimately this leads to cassettes that shift smoother and more precisely–and last longer–at a price thats friendly to the self-sponsored racer. The top five cogs are grouped as three and two respectively and are riveted to anodized aluminum spiders that add stiffness to improve shifting. The remaining six cogs are individual with spacers between and an anodized aluminum lockring screws into the freehub to hold the entire assembly together. One spline of the cassette is wider than the others and corresponds with the splines on the freehub so the cassette cogs can only be installed with the right clocking of the shifting ramps timing them for perfect chain pick-up and release. This innovation is true to Shimanos Japanese culture which uses the term “poka-yoketo refer to features–like these guiding splines–that serve as built-in wards against user error.