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  • Shimano - Ultegra 6800 Groupset - 172.5mm 50/34

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  • Shimano - Ultegra 6800 Groupset - 172.5mm 50/34

Shimano Ultegra 6800 Groupset

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    • 172.5mm 50/34, 11/25
      sale $699.95

    1 Review


    Trickle down at its finest.

    Ultegra has long been the workhorse group in Shimano's road lineup. But there is also beauty in strength, functionality, and fortitude. Shimano did not just rename the 6700 tier, however. Instead, just as the Dura-Ace groupset was completely redesigned for the 9000 series, so too has the Ultegra 6800 line been given a similar makeover so that it mimics the 11-speed functionality and aesthetics of its older sibling.

    Beginning with the most visible and noticed portion of the groupset, the ST-6800 levers feature a refined hood shape. They borrow the look and feel of Dura-Ace 9000, which, in turn, borrow their aesthetics from the venerable Di2 levers. The new design allows for improved grip and comfort, combined with crisper shifting. The hoods are molded from a dual-compound rubber composite. Below the hoods you'll find a sleek carbon lever with a more exaggerated outward curve than on the 6700. This makes for a more pronounced interaction with your hands from either the hoods or drops. Ten millimeters of reach adjustment for the levers accommodates a large variety of hand sizes and shapes. Although the redesign of the shifters is eye-catching, Shimano's "Rider-Tuned" philosophy is what gives the newly redesigned Ultegra such a solid rider experience. "Rider-Tuned" is the philosophy of providing added touches throughout the group, such as a shortened lever stroke. This shortened lever stroke increases the speed with which your shift moves up or down the chainrings and cassette.

    Moving through the drivetrain, the redesign of the front derailleur matches the new shorter stroke lever action of the shifters. To achieve this, Shimano had to revise the actuation ratio and pull yet another page from the Dura-Ace manual. The derailleur body was given a more heightened profile, with the leverage point at the top of the body. This creates a larger pull arm with more leverage, which strengthens the pull and eases the actuation, and thus lessens the shift stroke. In a similar manner, the rear derailleur was redesigned to be more compact, lightweight, and to ensure equal shifts across the cassette's entire 11-speed range. The new 6800 was designed with the same attention to the shorter stroke at the lever as Dura-Ace. This was done using a newly designed spring mechanism. The new spring mechanism ensures an equal, positive sensation regardless of the direction of shifting, unlike the more familiar Shimano "snap" moving up the cassette, and "drop" sensation on the way down. The combination of new levers and re-engineered derailleurs creates a reduction of 35% in shifting effort in the front. Add Shimano's proprietary, polymer-coated shift cable and mechanical drag is nearly eliminated.

    Even though the 11-speed shifters are initially the most noticeable component of the Ultegra groupset, it is the 6800 crankset that really steals the show. Once again, using Dura-Ace as its inspiration, you'll notice there is no comparison between the prior iteration of Ultegra and the new crankset. The 5-arm spider is absent and in its place is a 4-arm crankset, which not only matches rigidity of Dura-Ace while saving 26 grams of weight, it also is compatible with both standard and compact chainrings. Gone are the days of needing two sets of cranks for two sets of chainrings. Additionally, they were built using Shimano's Hollowtech II construction — the same method used in its big brother. The groupset includes Shimano's SM-BBR60 English Bottom Bracket.

    The Shimano 6800 brakeset is no exception to the makeover, either, and it has taken stopping power to a whole new level. Shimano began the design from the ground up. They used a dual-pivot design, so the mounting bolt is no longer also the pivot. As a result, the brake arms are now located symmetrically over the wheel and work independent of the mounting due to an integrated rolling cam. The cable stop is still to the side, but the new dual-pivot design allows any pull to apply equal tension to both arms. In addition, the arm placement is closer to the rim, which, coupled with the equal pull, drastically increases modulation. And if you run larger tires, Shimano is now producing a thinner brake pad for tires up to 28mm wide. Shimano claims that the new brake design has 10% more stopping power than its 6700 series.

    The Shimano Ultegra 6800 Groupset is available in three crank lengths: 170mm, 172.5mm, and 175mm, with either standard or compact chainrings. Each is available with either 11-25t or 11-28t rear cassettes.

    • Item #SHI001H

    Tech Specs

    Front Derailleur
    Shimnao Ultegra 6800 Braze-on
    Rear Derailleur
    Shimano Ultegra 6800 short cage
    Shimano Ultegra 6800
    Shimano Ultegra 6800
    50 / 34t, 53 / 39t
    Crank Arm Length
    170mm, 172.5mm, 175mm
    Bottom Bracket
    Shimano SM-BBR60 BSA English threaded
    Shimano Ultegra 6800
    Shimano CN-HG701
    Shimano Ultegra 6800
    Sprocket Range
    11 x 25t, 11 x 28t
    Cables / Housing
    Compatible Components
    Shimano 11-speed
    Recommended Use
    road cycling
    Manufacturer Warranty
    1 year

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Unanswered Question

    Do you offer this groupset with either a 11/30 or 11/32 cassette and do you need a longer rear derailleur arm with each' Thanks

    Unanswered Question

    Do you offer this groupset with an 11-32 cassette? is the front derailleur front or braze on?

    Unanswered Question

    I have a Cervelo S5 will it be able to take this group set and are there any modification I need to make to my bike?


    1 or 2 brakeset? Does it come with a front & a rear brkakeset. I only see the front in the picture

    yes it will have front and rear. some of the variants are out of inventory at the moment but I can likely help you out if that is the case for the size you want. just contact me directly

    Unanswered Question

    I have a frame with a PF30 bottom bracket. I'm looking to upgrade to Ultegra 6800. Will this bottom bracket work? If not, and I have to replace the bottom bracket, will the cranks still work with a different bottom bracket?

    My wife rides a 2014 Specialized Amira base model with a Shimano Sora (2 x 9 speed) groupset. Do I need to buy anything else to upgrade her bike or does this set includes everything she needs?

    Also, what crank length do you recommend for women on a 50/34 + 11/25?

    Crank length answer is that she should be fitted so as to determine t he correct length based on bike set up, inseam, riding position and cadence preference. In my case, I went from 175 to 165 and my cadence went way up.

    Unanswered Question

    Would it be possible to mix and match for this order or would I just have to purchase components separately? ie. Swap out the brakes for the RS685 Hydraulic STI Levers & Disc Brake Calipers Set rather than the caliper brakes? Also to change the cassette spec and front derailleur to a top pull cx70?

    Unanswered Question

    Why are you recommending buying the cassette & rear derailleur? Are they not a part of the group set?

    Is this a complete set to convert my 10spd to 11spd.

    I have sram rival 10 speed .

    Yes, this'll do the trick. You'll swap out all of your Rival parts for this group's Ultegra bits. The one issue you may have is with the bottom bracket. Note that this group comes with Shimano's BBR60, so be sure to verify your frame's BB type and get a different model as necessary.

    If you'd like help, click the Contact Us link in the top bar, and our bike nerds will help you figure it out.