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Discussion Starter · #1 ·
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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Discussion Starter · #4 ·
Thanks, but your comments do not respond to my question. I have a Di2 groupo.
 

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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.
 

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Discussion Starter · #10 ·
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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'brifter' is f'ing stupid
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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
 

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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...
 

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Discussion Starter · #16 ·
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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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? :idea:
 

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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.
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.
 

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Discussion Starter · #19 ·
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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Discussion Starter · #20 ·
I got my pulleys, I removed the bottom one, somehow the bearing was in off axis with the outer pulley. Don't know quite how that would happen, but I just put a new one in.
 
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