New Ultegra 8000 compatibility with 6800
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  1. #1
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    New Ultegra 8000 compatibility with 6800

    Does anyone know if Shimano has stated whether the new Ultegra will be compatible with 9000/6800/5800?

    Specifically I'm wondering if the new rear derailleur and cassette will work with 6800 (hydro) shifters. Having an 11-34 on my CX/gravel bike would be nice for some of the steeper climbs around here.

  2. #2
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    It'll work just fine, there was no change to the cable pull. R8000 is just a refinement of 6800.

  3. #3
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    The change is in the front and it's with the crankset and chainring spacing.

    They're going to want the new crankset to be paired with the new front mech.

    Other than that it's all compatible.
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  4. #4
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    Quote Originally Posted by MMsRepBike View Post
    The change is in the front and it's with the crankset and chainring spacing.

    They're going to want the new crankset to be paired with the new front mech.

    Other than that it's all compatible.

    Oh lord...don't tell me Shimano went and made a groupo that'll only shift right on Shimano's own extremely limited gearing choices....
    "Refreshingly Unconcerned With The Vulgar Exigencies Of Veracity "

  5. #5
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    Quote Originally Posted by Marc View Post
    Oh lord...don't tell me Shimano went and made a groupo that'll only shift right on Shimano's own extremely limited gearing choices....
    The new front mech will be good and solid and compatible with several cranks I imagine.

    So no worries there.

    The new cranks however *might* not work so well at all with past front mechs or front mechs from other companies.

    That's pretty much the deal.
    use a torque wrench

  6. #6
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    Shimano if not going to add "Compatible with 3rd party components from Praxis, Rotor, Wolftooth, Stages and MORE.!" to their marketing. They are the market leader.

    Those companies are more than welcome to market components to fill the odd gaps in Shimano's products.

    Shimano's target customer with this group set is the mainstream built road bike market.

    The compact gearing available up to 11x34 is more than enough , even for the majority of the adventure bike crowd.

  7. #7
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    The only difference is that the crank has moved the small ring inboard by .4mm and kept the large ring in the original position. The front derailleur has been profiled to allow it to move closer to the seat tube before it contacts and stops moving. Most bikes will have no issue here, but a handful may find their older derailleur may not be capable of moving far enough inboard to stop chain rub in the climbing gears. Not may bikes will have this issue, but a few will.

  8. #8
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    Quote Originally Posted by MMsRepBike View Post
    The change is in the front and it's with the crankset and chainring spacing.

    They're going to want the new crankset to be paired with the new front mech.

    Other than that it's all compatible.
    At the end of the day will this matter? On both my 6870 and 5800/6800 bikes I run Quarqs with SRAM rings on them and they work fine.

    Are the new rings backwards compatible with older cranks?

  9. #9
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    Quote Originally Posted by alxrmrs View Post
    At the end of the day will this matter? On both my 6870 and 5800/6800 bikes I run Quarqs with SRAM rings on them and they work fine.

    Are the new rings backwards compatible with older cranks?
    It matters if the spacing between the rings is different ( which I believe is the case here ).

  10. #10
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    Quote Originally Posted by Migen21 View Post
    It matters if the spacing between the rings is different ( which I believe is the case here ).
    What I forgot to add to this is that IIRC the spacing on SRAM 11 speed rings is slightly different than Shimano's own 4-bolt style.

  11. #11
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    It matters, but it doesn't. Like I said, the change is so small that Shimano's own techs mix and match on their personal bikes, I've seen it first hand and it works just fine 99% of the time.

  12. #12
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    chainrings?

    Anyone know if 6800 chainrings are compatible with r8000 cranks. Would you need to adjust the FD?

  13. #13
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    Quote Originally Posted by spookiekabuki View Post
    Anyone know if 6800 chainrings are compatible with r8000 cranks. Would you need to adjust the FD?
    The official answer from Shimano is "Nope!".

    The fact that the two have slightly different chainlines (*very slightly) probably matters quite a bit in this case.

    Then there is the physical and aesthetic differences (color, shape, etc..).

    I've never actually tried this, and personally wouldn't consider it. FWIW, I'm going to go with "Probably Not" compatible.


  14. #14
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    I changed a S works crankset due to the need for a shorter arm length (170mm) and to go from 53/39 to 50/34. It would seem FC 6800 cranksets are hard to come by, but a FC R8000 was available. So I used the BB30 bearings and fitted Wheel Manufacture adapators. It has Dura ace 9070 set up. A couple of points... The drive side crank arm seems to rotate close to the Fd housing and I was not able to adjust the cage inboard far enough to conform to Shimano's checks on there dealer manual. But there was still clearance in all gear positions. I then got a thin wave washer and put it on first to the axle. This now moves the chain rings outward by around 0.5mm. This now made the adjustment by the manual. It is working, not sure would the manual FD have the adjustment range. ..... I know it is not the tning to do, but as time goes on, Shimano will drop the spares for 6800/6870 and only the R8000 range will be available.

  15. #15
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    Anyone got a good resource for more info on mixing 6800 with 8000 and 9100?

    I've got full 6800, with the medium cage RD with an 11-32. I'm wanting to get r8000 brakes for more power, and one of my shifters is sticky when riding below freezing conditions, so thinking of buying:

    r8000 brake calipers for sure
    maybe r8000 shifters
    maybe r8000 cranks (to get stages gen3 power meter)
    maybe r8000 derailleurs

    Will all that work as shimano intended?

    Thanks

  16. #16
    'brifter' is a lame word.
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    You're good no matter what. Obviously if you get all R8000 it's gonna work. 6800 is compatible w/ 8000, brakes included.

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  17. #17
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    Not the question here, but the awesome thing with R8000 is the rear derailleur design, that incorporates a link in the style of the Wolftooth Roadlink. This allows larger cassettes. Officially up to 34t, but I have it working perfectly fine with an XT 11-40 cassette on a bunch of bikes. Very much awesome. Same with the R9100 Dura-Ace rear derailleur (but it is a good idea to swap the cage to something longer)

    In front, the main issue is typically the chainline. If you stay with road components, it will work just fine. 10spd, 11spd, sram or shimano front der, no problem.

  18. #18
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    Quote Originally Posted by cxwrench View Post
    You're good no matter what. Obviously if you get all R8000 it's gonna work. 6800 is compatible w/ 8000, brakes included.

    2018-2019 SHIMANO Product Information Web
    Thanks, that's great.

    Ordered the brakes, and will try to fix my right shifter (as if I can fix my 6800, then the shifters don't seem worth the upgrade).

    I bough a 6800 long cage rear and 11-32 cassette maybe 3 months before 8000 came out. If 8000 had been out, I would have gone for the long cage shadow with a 34. Now I just can't bring myself to swap derailleur and cassette again (that would be the 4th rear derailleur, and 3rd cassette I've upgraded in 5,000 miles. Always upgrading to get more gears, never because of wear).

    Thanks

  19. #19
    'brifter' is a lame word.
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    Quote Originally Posted by StillKeen View Post
    will try to fix my right shifter
    'Fix' a Shimano shifter? Good luck. What's the problem?
    I work for some bike racers
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