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Ultegra CS-R8100 12-Speed Cassette - Bike Build

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Why We Like The Ultegra CS-R8100 12-Speed Cassette

In Shimano's Ultegra R8100 series for road cycling, the Ultegra CS-R8100 12-Speed Cassette is a component that maximizes performance so much that we don't have to think about our next gear change on our ride. Larger driving cogs are responsible for enhancing drivetrain efficiency and creating compatibility with both Shimano 11- and 12-speed freehub bodies. This cassette lets us climb up canyons, sprint across the flats, and coast down winding descents with ease and efficiency. Under maximum pedaling force, we can still expect peak performance and faster, smoother shifting action.


  • Shimano's Ultegra 12-speed cassette for peak performance shifting
  • 12-step gear combination for efficiency and acceleration
  • Hyperglide+ technology for seamless shifting
  • Compatible with 12-speed and road 11-speed freehub bodies
  • Item #SHIU1FS
Cog Sizes
11-30t, 11-34t
Cog Material
Freehub Type
Shimano 11- and 12-speed road
Carrier Material
Claimed Weight
[11-30t] 291g, [11-34t] 345g
Manufacturer Warranty
2 years
road cycling