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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: 454
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.

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PostPosted: Thu Dec 05, 2013 10:59 pm 
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Joined: Sun Dec 01, 2013 3:46 pm
Posts: 70
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
Posts: 454
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
Posts: 233
Is the FD stiffness brace set hard against the seat tube? Just because the braze on tab is tight doesn't mean it isn't flexing under shift load.


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PostPosted: Thu Dec 05, 2013 11:19 pm 
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Joined: Sun Dec 01, 2013 3:46 pm
Posts: 70
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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