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Thread: Di2 pulleys

  1. #1
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    Di2 pulleys

    My bottom pulley is getting pretty wobbly and today it was squeaking.

    I got a orginal Di2 Ultegra groupo. Are the pulley sets the same with a mech RD?

    I found a Shimano Ultegra 6700-A 10 spd kit online, will that work?

    I been to several shops on my other mech set and never had much luck finding any pulley kits at any LBS I went too! I guess I am pretty hard on those pulleys.
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  2. #2
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    Why not just clean and lube them until you get replacements?
    Too old to ride plastic

  3. #3
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    Here's the EV of the Rd-6770 http://si.shimano.com/pdfs/ev/EV-RD-6770-A-4116.pdf

    It looks like you could use the pulleys from a 6870 RD if you can find that.

  4. #4
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    Thanks, but your comments do not respond to my question. I have a Di2 groupo.
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    Quote Originally Posted by duriel View Post
    Thanks, but your comments do not respond to my question. I have a Di2 groupo.
    Actually, they do. The 6770 that I referenced is the original Ultegra DI2 RD that you indicated you had. If you look at the EV that I posted a link for, it shows that the 6870 RD, the 11sp Ultegra DI2 RD, uses pulleys that are compatible with the 6770 that you indicated you have.

  6. #6
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    Quote Originally Posted by duriel View Post
    Thanks, but your comments do not respond to my question. I have a Di2 groupo.
    Wait...what...?
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

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    Quote Originally Posted by cxwrench View Post
    Wait...what...?
    Di2 pulleys are magic.
    use a torque wrench

  8. #8
    'brifter' is a lame word.
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    Quote Originally Posted by duriel View Post
    Thanks, but your comments do not respond to my question. I have a Di2 groupo.
    Quote Originally Posted by MMsRepBike View Post
    Di2 pulleys are magic.
    He must have the Di2 brakes as well...
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  9. #9
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    Quote Originally Posted by cxwrench View Post
    He must have the Di2 brakes as well...
    count on it.

    Di2 crankset too.
    use a torque wrench

  10. #10
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    Well, that diagram does not look anything like my RD. Mine has a rear structure that kinda looks like a can from the rear. I think they made a design change. The diagram doesn't indicate whether it is 10 or 11 speed that I can see.

    I don't know what the product number is, where can u find this?
    When I google pulley kits, it comes up with a different kit for 8,9, 10, & 11 speeds, so I don't see how a 11 speed pulley is the same as my 10 speed. I'm not saying it won't work, but if I'm ordering something it may as well be the correct part.

    I went to shimano web site, it is a mess, I do a search in the archives for 2012 Di2 and the tech pdf doesn't even list it.

    What I need is a diag for my RD & a diag for a mech RD, 2012 indicating they are the same product number. Or someone that has a pulley kit for a 2012 Di2 Ultegra.
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  11. #11
    'brifter' is a lame word.
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    Jesus...they're both 10 speed. They're both 67xx derailleurs. In the tech docs there are different part #'s, the Di2 derailleur uses the ceramic bushings, the mechanical does not. That's the only difference. They both use the same 12.5mm/10.5mm axle bolts. I am quite sure they're interchangeable. The Shimano part # for the 6770 pulleys is:

    Y5X998080
    I work for some bike racers
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  12. #12
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    use a torque wrench

  13. #13
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    Why do you keep posting 11 spd stuff?
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  14. #14
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    Quote Originally Posted by duriel View Post
    Why do you keep posting 11 spd stuff?
    Because I'm a professional bike mechanic, and that's what I do.

    I'm going to tell you to use an 11 speed chain as well. Woah, calm down now. I know... really I do... that 10 and 11 are different numbers.

    But maybe, just maybe...
    use a torque wrench

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    This thread should be merged with the marijuana thread.

    now that it's mostly legal does anyone burn......
    Too old to ride plastic

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    You are a professional BM. In shimano's own literature it states not to use 11 spd pulleys with 10 spd. I'm not a professional BM, so I'm going with what the manufacturer states.
    I previously stated I wanted the exact right component, if I wanted to use any old thing, I could have got something out of my spare parts bin & wouldn't be here.
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  17. #17
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    Quote Originally Posted by MMsRepBike View Post
    Because I'm a professional bike mechanic, and that's what I do.

    I'm going to tell you to use an 11 speed chain as well. Woah, calm down now. I know... really I do... that 10 and 11 are different numbers.

    But maybe, just maybe...
    It's funny how so many people don't understand the idea of a 3/32" chain and how it works. 11 speed chains work fine on 10 speed cogs. Wonder why that is?
    I work for some bike racers
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    and a bunch of skateboards

  18. #18
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    Quote Originally Posted by duriel View Post
    You are a professional BM. In shimano's own literature it states not to use 11 spd pulleys with 10 spd. I'm not a professional BM, so I'm going with what the manufacturer states.
    I previously stated I wanted the exact right component, if I wanted to use any old thing, I could have got something out of my spare parts bin & wouldn't be here.
    Shimano's own literature, in the form of the link to the RD-6770 EV that I posted in my initial reply to you, show the pulleys from the RD-6770 (10sp DI2 RD) as compatible with those from the RD-6870 (11sp DI2 RD) - go figure.

  19. #19
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    Yea, it is all very simple. And the product compatiblilty possiblilties are clearly obvious.

    Anyway I got what I need, have a great day!
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