Shimano Ultegra CS-R8000 11sp CassetteShimano's 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 preciselyand last longerat a price that's friendly to the self sponsored racer. The top five cogs are grouped as three