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  • Shimano - Ultegra CS-R8000 Cassette - Gray
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  • Shimano - Ultegra CS-R8000 Cassette - Gray

Shimano Ultegra CS-R8000 Cassette

27% Off
sale from $62.95 $88.99

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    • Gray, 11x25
      sale $62.95
    • Gray, 11x28
      sale $62.95
    • Gray, 11x30
      sale $64.95
    • Gray, 11x32
      sale $67.95
    • Gray, 12x25
      sale $67.95
    • Gray, 14x28
      sale $79.95

    10 Reviews


    Just a cog in the wheel.

    Shimano's Ultegra group is one of the most popular out there with good reason: it's 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.

    Shimano'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 precisely—and last longer—at a price that's 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 Shimano's Japanese culture, which uses the term "poka-yoke" to refer to features—like these guiding splines—that serve as built-in wards against user error.

    Shimano Ultegra cassettes shift so well and are so unnoticeable that even World Tour teams will often sub Ultegra cassettes to get the bikes to the minimum weight limit. Frames and wheels are just so light these days, and adding mass to the cassettes isn't too detrimental to performance, and the Ultegra units shift on par with Dura Ace while actually lasting much longer.

    Please note that the new Ultegra RD-R8000 Shadow Rear Derailleur comes in two sizes, short and long cage. Cassettes up to 11-30t are compatible with the short version, while 30t cogs and up require the longer model.

    • Long-lasting racing cogs for the self-sponsored cyclist
    • Reliable, durable steel preforms like Dura-Ace plus a few grams
    • Precisely machined ramps allow for accurate 11-speed shifting
    • Ranges available for crits to climbs to gravel grinds
    • Shimano's Ultegra R8000 drivetrain leads the way for best value in the industry
    • Item #SHI00FZ

    Tech Specs

    Cog Sizes
    11 x 25t, 11 x 28t, 11 x 30t, 11 x 32t, 12 x 25t, 14 x 28t
    Cog Material
    nickle-plated steel
    Carrier Material
    Claimed Weight
    [11x25] 232g, [11x28] 251g, [11x30] 269g, [12x25] 243g, [14x28] 300g
    Recommended Use
    Manufacturer Warranty
    2 years

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    As Advertised

    • Familiarity: I've used it once or twice and have initial impressions

    I love how Competitive Cyclist always has quality components and clothing at competitive prices. Though I should have pulled the trigger a week prior because it was even less, I still felt that I received the best deal at the time from all of their competitors. This cassette will be a match for my new Enve 3.4 disc wheels, to match my current stock wheel/cassette combo.

    Works great, training & racing (11-25)

    • Familiarity: I've put it through the wringer

    Bought two, to have one on the indoor trainer rear wheel and, one for road rides rear wheel setup. Hard to beat for the price and the mid level weight, compared to dura-ace or Sram XD at three times the cost for only 50-70 grams less, save those for race day! Can usually get 2-3 chains worth of life out of one rear cassette and set of front chain rings, then again, I clean my drive line after every ride and lube it, makes a huge difference in life of chain, gears, and how bike shifts.

    smooth as butter

    • Familiarity: I've put it through the wringer

    Smooth precise shifting. Purchased 11-25 to replace 11-21 for middle-gear range benefits. Ultegra - highest quality cassette with probably a little more durability than Dura Ace. (Obviously, a little heavier)

    Light, Durable and Quiet

    • Familiarity: I've put it through the wringer

    Perfect cassette for the money. Running 11-28 with SRAM Etap and DuraAce Chain. Crisp, precise shifting and seems to run a tad quieter than its 6800 counterpart.

    Weight Savings!

    • Familiarity: I've put it through the wringer

    I upgraded my 105 5800 to the new Ultegra R8000, and purchased the 11-28 cassette to match my new short cage derailleur. Coming from an 11-32 105 cassette, this upgrade to Ultegra earned me a 60 gram savings! Ultegra 11-28 cassette weighed 246 grams on my PT scale.

    Finally... a 32!

    • Familiarity: I've used it several times

    I gave this cassette as a gift to a family member who was really looking for a little bit more to help climb the canyons around us. Installing is the same as all Shimano cassettes, and the shifting is smooth and crisp! She is extremely happy knowing that she can run the R8000 cassette with her existing 6800, and is now able to go climb the roads just in time for fall.
    If you have any questions on the new R8000 gear, please reach out to me.

    Just purchased new carbon wheel sets from CompCyclist....can this Ultegra CS-R8000 11x32 & Ultegra CS-HG800 11x34 cassette competable with my new 105 11 speed group set ? Wanting to replace and/or upgrade 105 CS-R7000 11x32 cassette with this?

    I have a 6800 11-28 cassette on my wheel. Can I use this 8000 11-28 cassette on a spare wheel for my trainer and not have to fuss with adjusting the derailleur?

    With same question in mind, I bought r8000, actually couldn't find original cs6800 at least 1 year ago.

    Have no problem with original cs6800 outdoor, but some noise especially in one of mid gear (maybe fifth) while Zwift.

    Nowadays find a cs6800 casette and try to be sure, if it is real problem or anything else

    A follow up question. Can a 11 30 cassette be used with a short cage 6800 Di2

    I need to replace my 11-28 6800 cassette and chain. Is the R8000 compatible

    Absolutely. R8000 cassette and chain are compatible with the older Ultegra 6800 groupset. Please let me know if you have any further questions. or direct line 801-619-7476