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  1. #1
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    11 speed derailleurs 10 cassette/shifters

    I am working on my new bike build. i want to buy the ultegra 6800 11 speed derailleurs but run 105 10 speed shifters and cassette. I know i can run the FD just fine, but I should also be able to run the rear derailleur as a 10 speed right?? Or would there be too much slack??

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    L-I-V-I-N dtrain's Avatar
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    From everything I've heard, it should be fine. I actually have a 6800 braze-on FD available for sale:
    Shimano Ultegra 6800 Brake Calipers and Derailleurs (NEW)
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    Quote Originally Posted by calgarc View Post
    I am working on my new bike build. i want to buy the ultegra 6800 11 speed derailleurs but run 105 10 speed shifters and cassette. I know i can run the FD just fine, but I should also be able to run the rear derailleur as a 10 speed right?? Or would there be too much slack??
    You may want to check on that FD too. 6800 has an extended arm so the pull would be different than the 105. It may work, I don't know, but you may want to find out. Unless you already have, then that's good news for me too.

    Quite different, 6800 vs 5700.



    Last edited by zymphad; 05-22-14 at 11:40 AM.

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    L-I-V-I-N dtrain's Avatar
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    The official Shimano charts don't really show any 11 speed and 10 speed mixing. I know the 5700 shifter wouldn't take advantage of the 6800's redesign...but I thought I'd heard that it'll still work.

    The bigger question is why. If wheels and/or shifters are holding the OP back from a full 11-speed build, that's fine. But why not build with 10 speed derailleurs? I don't no about 'slack', but the RD jockey wheels are likely different.
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    If OP has 10 speed wheels that be doesn 't want to replace, he can run a complete 11 speed group but just remove the smallest cog from the 11 speed cassette. According to an older thread this works with certain lock rings. Then he would adjust the limit screws to only allow 9 shifts to use the 10 cogs.
    Last edited by rpenmanparker; 05-22-14 at 03:00 PM.
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    its a new build, I want to go with ultegra mechs purely to make future upgrades easier. especially when the 11 speed 105's come out, i can just swap the wheelset and the shifters

    this allows me to enjoy my new bike while i can afford to without having to wait for the 105 set to come out. i am thinking ong term with this as well with this.

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    Quote Originally Posted by calgarc View Post
    its a new build, I want to go with ultegra mechs purely to make future upgrades easier. especially when the 11 speed 105's come out, i can just swap the wheelset and the shifters

    this allows me to enjoy my new bike while i can afford to without having to wait for the 105 set to come out. i am thinking ong term with this as well with this.
    a "new" build, but I'm guessing you have the 10 speed shifters?

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    Quote Originally Posted by calgarc View Post
    its a new build, I want to go with ultegra mechs purely to make future upgrades easier. especially when the 11 speed 105's come out, i can just swap the wheelset and the shifters this allows me to enjoy my new bike while i can afford to without having to wait for the 105 set to come out. i am thinking ong term with this as well with this.
    Considering the occasional phenomenal deals offered by the UK online stores, I would just go Ultegra now. The difference may well be negligible.
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    Quote Originally Posted by rpenmanparker View Post
    Considering the occasional phenomenal deals offered by the UK online stores, I would just go Ultegra now. The difference may well be negligible.
    I do not have money to go full ultegra right now. I can go full 105 with an ultegra FD and save the rest for later. maybe even shell out for a RD if this idea works

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    I have a frame, fork. i recently ordered a headset and bottom bracket

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    Quote Originally Posted by dtrain View Post
    The official Shimano charts don't really show any 11 speed and 10 speed mixing. I know the 5700 shifter wouldn't take advantage of the 6800's redesign...but I thought I'd heard that it'll still work.

    The bigger question is why. If wheels and/or shifters are holding the OP back from a full 11-speed build, that's fine. But why not build with 10 speed derailleurs? I don't no about 'slack', but the RD jockey wheels are likely different.
    I doubt the FD would work. The 6800 has such short throws, I think you would get very interesting shift behavior with the 105 shifters.
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    Senior Member fstshrk's Avatar
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    Quote Originally Posted by calgarc View Post
    I do not have money to go full ultegra right now. I can go full 105 with an ultegra FD and save the rest for later. maybe even shell out for a RD if this idea works
    Then wait. 5800 is right around the corner.
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    Senior Member kleng's Avatar
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    Read the section on "a cautionary tale about ultegra compatibility"

    Technical FAQ: Revisiting drivetrain cross-compatibility - VeloNews.com

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    Why not bite the bullet and just buy the entire 6800 group? it's cheap from the UK sellers. I can't imagine 105 5800 being that much cheaper.

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    Hey! quick question I have a bike that has 105 components looking to upgrade a piece or two from the components of my bike now to the ultegra 6800? What parts can I switch right off and have no problem since my bike 10 speed and the new groupo is 11 speed?

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    I have a question, right now my bike is 10 speed and has 5700 components (shimano) looking to upgrade to some ultegra 6800 parts. Can i switch a thing or two from my current bike parts to the new ultegra 6800 without a problem? or should I just change everything like buy the whole groupo?

  17. #17
    L-I-V-I-N dtrain's Avatar
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    Calipers are the exact same pull, but 6800 is nicer (from what I hear).
    "The older you do get, the more rules they're gonna try to get you to follow. You just gotta keep livin', man, L-I-V-I-N." - Wooderson

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    i could also go 5700 and upgrade the rear mech and sti for it next year... hell maybe even satisfy a few of my other foot powered obsessions

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    Quote Originally Posted by calgarc View Post
    i could also go 5700 and upgrade the rear mech and sti for it next year... hell maybe even satisfy a few of my other foot powered obsessions
    Again, where are you getting that 6800 derailleurs are compatible with 5700 shifters? I just don't see it. The pull and indexing are not the same. The shape and design of 5700 and 6800 are not the same for both RD and FD. Where the cables are attached aren't the same either.

    I just don't see how you can upgrade piece by piece. If you upgrade RD and STi, you'll need to upgrade the cassette, chain, crank, wheel (11 spd compatibility), FD, etc.

    Just curious where are you getting info you can upgrade piece by piece and where it says the Shimano 10 and 11 spd are interchangeable. I'd like to see a thread with multiple people verifying this is possible.
    Last edited by zymphad; 05-23-14 at 12:17 AM.

  20. #20
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    Quote Originally Posted by zymphad View Post
    Again, where are you getting that 6800 derailleurs are compatible with 5700 shifters? I just don't see it. The pull and indexing are not the same. The shape and design of 5700 and 6800 are not the same for both RD and FD. Where the cables are attached aren't the same either.

    I just don't see how you can upgrade piece by piece. If you upgrade RD and STi, you'll need to upgrade the cassette, chain, crank, wheel (11 spd compatibility), FD, etc.

    Just curious where are you getting info you can upgrade piece by piece and where it says the Shimano 10 and 11 spd are interchangeable. I'd like to see a thread with multiple people verifying this is possible.

    lol what i should have said was upgrade next year when the 5800 is out lol.

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