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PostPosted: Thu Dec 05, 2013 10:33 pm 
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Joined: Wed Jan 10, 2007 10:56 pm
Posts: 487
Location: Canada
And here's a 10 speed Dura Ace Di2 7970 setup with the SRM Dura Ace 7900 crank, Shimano 7900 50/34 chain rings, after probably 5000 km.

Image


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PostPosted: Thu Dec 05, 2013 10:59 pm 
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Joined: Sun Dec 01, 2013 3:46 pm
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I mean can you warranty a crank for that or am I just SOL? The more I have been playing with this it seems it is a ramp and pin/crank thing. I have exhausted the FD.


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Posted: Thu Dec 05, 2013 10:59 pm 


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PostPosted: Thu Dec 05, 2013 11:10 pm 
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Joined: Wed Jan 10, 2007 10:56 pm
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Location: Canada
I think the marks on the crank and rings are the symptom, not the cause. And I don't think that would affect shifting quality. As others have said, and in my experience with over 20 di2 installs of various configs, the front shifting should be pretty perfect, and that goes for all kinds of cranks and rings. There has got to be something about your FD or setup that's not right. Good luck.


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PostPosted: Thu Dec 05, 2013 11:11 pm 
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Joined: Tue Apr 17, 2012 11:20 am
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.


Last edited by Causidicus on Tue Jun 17, 2014 11:23 pm, edited 1 time in total.

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PostPosted: Thu Dec 05, 2013 11:19 pm 
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goodboyr wrote:
I think the marks on the crank and rings are the symptom, not the cause. And I don't think that would affect shifting quality. As others have said, and in my experience with over 20 di2 installs of various configs, the front shifting should be pretty perfect, and that goes for all kinds of cranks and rings. There has got to be something about your FD or setup that's not right. Good luck.


I appreciate all of your help. I guess a new bike is in order... :wink:


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PostPosted: Wed Jun 11, 2014 10:03 am 
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Joined: Mon Oct 25, 2004 5:56 pm
Posts: 159
Hi.
I have Ultegra 6870 with SWorks crankset and SRAM chainrings.
With 34 is absolutely silent in every gearing, but with 50 there is a kind of noise increasing with cadence and speed. The shifting is flawless.
I have noticed that the support bolt is not touching the frame, so it's useless...do you suggest me to adjust it to touch the frame? Could it be the solution for the noise?


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PostPosted: Wed Jun 11, 2014 1:01 pm 
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Joined: Tue May 23, 2006 9:39 pm
Posts: 283
maybe the chain is too short...causing too much tension?

did you set up your RD in the 5th gear...so the trim works properly? (or is that with the older 7090?)

_________________
- Parlee Z5 SLi + DA9070 + Enve 3.4 Tune/Dash hubs
- Independent Fabrication Ti FLW + Campy SR11 + Enve 3.4 CK hubs


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PostPosted: Wed Jun 11, 2014 1:33 pm 
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Joined: Wed Jan 10, 2007 10:56 pm
Posts: 487
Location: Canada
scico wrote:
Hi.
I have Ultegra 6870 with SWorks crankset and SRAM chainrings.
With 34 is absolutely silent in every gearing, but with 50 there is a kind of noise increasing with cadence and speed. The shifting is flawless.
I have noticed that the support bolt is not touching the frame, so it's useless...do you suggest me to adjust it to touch the frame? Could it be the solution for the noise?


Just set everything up from scratch according to the dealers manual. That support bolt should not be "useless", and my suspicion is if that's not set up properly, other adjustments are out too, so going back to square one and following the dealers manual is a good first step. If the problem remains, report back at that time.

http://si.shimano.com/php/download.php?file=pdf/dm/DM-UL0001-00-ENG.pdf


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PostPosted: Fri Jul 04, 2014 6:05 pm 
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Joined: Wed Feb 20, 2013 7:37 pm
Posts: 39
LoggingMiles, have you resolved your issues? I'm having similar problems on my 6870 with Praxis rings.


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PostPosted: Fri Jul 04, 2014 6:32 pm 
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I never solved it with Praxis Rings. I swapped to a DA 9000 crank and all is well in the world. Follow Goodboyr's tips they are all spot on. The support bolt is definitely NOT useless, and probably the most critical thing to the entire front shifting experience. Once you have the derailleur cage perfectly parallel to the rings and 1-3mm above the largest chainring, then just setup the limits as it states in the dealer manual and you will be good to go.

When the entire setup is Shimano I have had a flawless experience with the shifting.


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PostPosted: Fri Jul 04, 2014 6:35 pm 
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Joined: Fri Sep 17, 2010 4:48 pm
Posts: 153
I know this is totally one of those silly questions but have you lubricated your drivetrain with a good high quality lube? I ask only as I've found that and dry DA9070 chain is loud and certainly not as smooth at one that's been properly lubricated.

Also, is your crank properly seated in the bearings, and then bearings in the frame. Do you need wave washers for preload or anything else like that? If there's any lateral movement it'll totally throw off the shifting.

Are the chainrings bent at all? Again, silly question but worth a look.

My DA9070 was a cinch to setup and worked flawlessly out of the box- I hope you can get yours resolved as it's an amazing system. I feel for ya. Good luck.


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PostPosted: Fri Jul 04, 2014 6:36 pm 
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kode54 wrote:
maybe the chain is too short...causing too much tension?

did you set up your RD in the 5th gear...so the trim works properly? (or is that with the older 7090?)


Yup. If you set it up via the dealer manual using their Big/Big technique then I bet it is a tad short. In the dealer manual they also show you the small/small method for cassettes smaller than 28. Use that method and see if you need to add a link. If you do, add a link and I bet it goes away. When it was time for a new chain I added a link and when riding in the 53 there is considerably less noise.


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