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PostPosted: Wed Jan 14, 2015 6:25 pm 
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Joined: Sun Jan 16, 2005 1:52 pm
Posts: 478
Location: Switzerland
I'm setting up the gearing of a friends bike. Before there was a gearing of 11-28 rear and front 34/50, that always worked perfect on a 10 speed Di2. Now a new crank with 2 different bcd's is being used. For the small ring it's 110 and for the big it's 130.
For the tech geeks out there, would it be possible to shift a combo 52/34? Since the big ring has a bcd of 130 it would at least support a 52 ring better than a classical bcd 110 compact crank.
Thanks.


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PostPosted: Wed Jan 14, 2015 10:23 pm 
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Joined: Sun May 27, 2012 2:11 pm
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Location: Tucson, AZ
Atleast with with the DA9000 spider, there were some pro teams running 52 or 53/34 with Di2 (Belkin in particular comes to mind).


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Posted: Wed Jan 14, 2015 10:23 pm 


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PostPosted: Fri Jan 16, 2015 9:38 am 
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Location: Switzerland
I ordered a 52 ring and will comment on how good it shifts.


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PostPosted: Fri Jan 16, 2015 6:19 pm 
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Joined: Thu May 12, 2011 5:06 am
Posts: 20
Location: Boulder, Colorado
el condor wrote:
I'm setting up the gearing of a friends bike. Before there was a gearing of 11-28 rear and front 34/50, that always worked perfect on a 10 speed Di2. Now a new crank with 2 different bcd's is being used. For the small ring it's 110 and for the big it's 130.
For the tech geeks out there, would it be possible to shift a combo 52/34? Since the big ring has a bcd of 130 it would at least support a 52 ring better than a classical bcd 110 compact crank.
Thanks.


Im going to shed some light because I know the traditionalists will say it cant be done, nor should it be done. I am always one to go ahead and give it a shot and report back my findings. Its one of those things that some people always wondered but never attempted to try it whether it be because of the hassle of switching rings or the cost.

The short answer is yes.

Does it shift smoothly? IMO experience... absolutely buttery smooth.

I have experimented with the 52/34 (11-28) and the 53/34 (11-28). Each of them were run months at a time. Each of the options work flawlessly with Di2.

For some "security" I added a K-Edge Chain catcher to be on the safe side when switching back to the small ring but even before I added it, I have absolutely 0 issues. Feel free to PM if you have any questions

Here is an older thread about someone asking the same questions.
viewtopic.php?f=3&t=125646

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PostPosted: Fri Jan 16, 2015 8:04 pm 
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Joined: Mon Jan 21, 2008 12:09 pm
Posts: 2528
There are some photos of the bike I built for my son in this thread on page 6. http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=110333&hilit=kinesis&start=75

The bike was using a 38/30 chainring combination with Ultegra di2 and we had absolutely no trouble shifting. He's on a 52/34 now and it works perfectly.

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San Diego, CA
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English Custom Steel Internal di2
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Posted: Fri Jan 16, 2015 8:04 pm 


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PostPosted: Sat Jan 17, 2015 10:06 am 
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Joined: Sun Jan 16, 2005 1:52 pm
Posts: 478
Location: Switzerland
Thanks for the inputs. I will try it too, looking at the space left in the front derailleur with 50/34 it should work. Maybe the only down part is cross chaining, small ring front-third to second heaviest rear may cause the chain to rattle on the big ring.
I remember ten years ago I put a 30 tooth as lightest gear on the dura ace 7800 mechanical set up with 50/34 front, smallest that would exist back then from Shimano was e 27tooth, it always worked flawless for many thousand km's, so sometimes it's better to try out things :thumbup:


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