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PostPosted: Thu Feb 13, 2014 12:33 am 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1442
Location: Santa Cruz, California, USA
I've always avoided making the chain too short to handle the big/big combo. Because even though I don't use big/big and usually keep pretty good track of what gear I am in, a couple times I have had serious oxygen debt, high altitude or extreme fatigue cause my brain to malfunction so much that I have shifted into the big/big combo. If the chain's too short the ride is going to end there. If there's not enough wrap I'd rather it be slack on the small/small. A slack chain won't instantly destroy the bike or derailleur the way a too short chain will.


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Posted: Thu Feb 13, 2014 12:33 am 


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PostPosted: Thu Feb 13, 2014 8:54 am 
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Formerly known as wassertreter

Joined: Tue Apr 12, 2011 8:08 am
Posts: 1747
Location: Pedal Square
eric wrote:
[...] shifted into the big/big combo. If the chain's too short the ride is going to end there.

Not my experience. Once put a 34t cassette on a long cage RD-6700 to see it would clear (which it did), with the chain length set for 27t max. One could just not shift from the second to the biggest cog, with good resistance feedback on the lever. Only cautiously tried on the stand, though. If you tried to shift with brute force, maybe things would go wrong. But you could clearly feel something was not right, even without looking. (Also not sure of what would happen with an electronic RD).

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PostPosted: Thu Feb 13, 2014 9:32 pm 
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Location: Santa Cruz, California, USA
Cautiously on the stand, yea no problem. On a ride when your brain is foggy, well I would not expect a happy outcome.

Even on the stand I have run into trouble with a too short chain. The derailleur cage caught on a cog and stuck the whole thing. I got it apart without much damage but it took some fiddling.


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PostPosted: Thu Feb 13, 2014 10:23 pm 
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Formerly known as wassertreter

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Location: Pedal Square
Yes well driving the mech into the cluster is something else. If the RD doesn't clear the top cog, don't even think about riding, because it will not work with the small ring either.

But generally agreed, better safe than sorry. In my case I was using a big cassette just for a hillclimb. All small-ring business, no danger of cross-chaining.

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PostPosted: Fri Feb 21, 2014 1:35 am 
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in the industry

Joined: Sun Jun 15, 2008 4:57 am
Posts: 327
Location: Irvine, CA
FIJIGabe wrote:
We all know that Shimano did not make a mid/long cage rear derailleur for the DA9000 level. However, I recently acquired an Ultegra 6800 GS rear derailleur, and I don't see why the long cage wouldn't work on my DA derailleur, other than the weight penalty.

With that in mind, does anyone know anywhere that makes, or would be willing to make, a longer RD cage? I contacted Fibre-Lyte, and they have no plans to make such a beast, and none of my searches have provided me with an answer.

Thanks.


Berner
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PostPosted: Mon Apr 07, 2014 3:30 am 
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Where can one buy one of these cages from berner or K edge? I seem em on google images but not in any stores.

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PostPosted: Mon Apr 07, 2014 5:48 am 
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Joined: Sat Jul 20, 2013 6:11 pm
Posts: 130
my LBS says they have done a number of ultra mid cages to 9070 Di2 RD with no issues... I was just going to go 6870 di2 RD mid... but they actually brought it up... my build is waiting on 9000 cranks with stages... so I am still ~3-4 weeks from my build.


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