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Dura Ace 9000 to Ultegra 6800 GS Cage Swap Questions

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Dura Ace 9000 to Ultegra 6800 GS Cage Swap Questions

Old 05-19-16, 11:27 PM
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Fastfwd01
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Dura Ace 9000 to Ultegra 6800 GS Cage Swap Questions

I did a little research on this before I bought the bike with the Dura Ace components and it seemed like I found a source for the Ultegra 6800 GS long cage and info on doing this that made me believe it was not a big deal if I decided I wanted to try it. Well, I might like to go ahead and do this but I'm having a little trouble finding a lbs that can find the parts needed and some that just don't know if it can be done (at least one knows it can be done and does this for customers).

Any known sources for these parts online? The entire Ultegra derailleur only goes for like $65 online. I would hope the cage might be found for considerably less than that.

Any issues to be concerned about putting a longer cage than Shimano makes for the Dura Ace rear derailleur? Added stresses on more lightweight parts, etc.?

One mechanic told me that the assembly takes a third hand type of tool to get the spring installed - is that correct? He said he has only done it once before and it was much more difficult than he anticipated.
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Old 05-20-16, 05:11 AM
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To start, Shimano don't make 'long' cage road RD's, only short (SS) and medium (GS) only MTB's have the long (SGS) option.

So what your looking for is a RD-6800 GS version. For this, and the SS, you can buy the inner plate as a spare, but if you want to use a compete cage, you will need to purchase a complete RD and strip it down. For it being compatible with a 9000, looking at the PDF's on SI Shimano, they are similar, but that's all, so thinking you on your own if they don't work.

Here are a few other links which maybe useful

Dura Ace 9000 Mid/Long Cage - Weight Weenies - can't find any info on this on the current K-edge site, so it may have been discontinued.

http://www.bikeforums.net/tandem-cyc...-retrofit.html
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Old 05-20-16, 07:06 AM
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Do yourself and your LBS a favor and just buy the entire RD-6800GS. It will be simpler and is assured to work properly. You will also have the intact DA derailleur to use if the Ultegra doesn't work out. If the cost is an issue, sell the DA derailleur and get some or most of your money back.
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Old 05-20-16, 09:16 AM
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Originally Posted by Fastfwd01 View Post
I did a little research on this before I bought the bike with the Dura Ace components and it seemed like I found a source for the Ultegra 6800 GS long cage and info on doing this that made me believe it was not a big deal if I decided I wanted to try it. Well, I might like to go ahead and do this but I'm having a little trouble finding a lbs that can find the parts needed and some that just don't know if it can be done (at least one knows it can be done and does this for customers).

Any known sources for these parts online? The entire Ultegra derailleur only goes for like $65 online. I would hope the cage might be found for considerably less than that.

Any issues to be concerned about putting a longer cage than Shimano makes for the Dura Ace rear derailleur? Added stresses on more lightweight parts, etc.?

One mechanic told me that the assembly takes a third hand type of tool to get the spring installed - is that correct? He said he has only done it once before and it was much more difficult than he anticipated.
The sweep angle of the 6800 GS body is not the same as the 9000.

Just swap out the RD when you need to use something bigger than a 32.

Once you've got the stops set, it's about 10 minutes to swap out the RD and put on a longer chain that has a quick link.
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Old 05-21-16, 07:45 AM
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Thanks! I finally did find a post on another site the evening I posted this that confirms what you all are saying about the cage not being correct.
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Old 05-21-16, 09:04 AM
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Originally Posted by Fastfwd01 View Post
Thanks! I finally did find a post on another site the evening I posted this that confirms what you all are saying about the cage not being correct.
Regardless, it won't be easy to find the cage you're looking for plus the cost will be a large fraction of the cost of the derailleur.
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