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Mixing Dura Ace 7900 & Ultegra 6700? How far can you go?

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Mixing Dura Ace 7900 & Ultegra 6700? How far can you go?

Old 06-12-12, 06:13 PM
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lung
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Mixing Dura Ace 7900 & Ultegra 6700? How far can you go?

Currently I'm running full Ultegra 6700. I'm about to swap my Ultegra Crankset for a Dura Ace 7900. As I slowly upgrade to Dura Ace, what can I mix and match? And what won't work. Thanks.
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Old 06-12-12, 07:14 PM
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Google shimano compatibility chart. If I recall correctly, there should be no issues between mix-and-match of the 7900, 6700 components.
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Old 06-13-12, 12:01 AM
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Originally Posted by fstshrk View Post
Google shimano compatibility chart. If I recall correctly, there should be no issues between mix-and-match of the 7900, 6700 components.
whoa boy. not so fast there.

I got into this a bit once, and I recall that there is an important distinction, at least according to shimano's charts.

if you look at 2011 charts, there is a clear distinction on the front end:
FD7900 and ST7900 at no point are linked to their 6700 or below counterparts. (that's the brifter and the front der.)

that's really it, not including the Di2 components (which are numbered 7970 and 6770 anyway)

No idea what science or tech underlies the charts, but I've always had good success sticking to them.
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Old 06-13-12, 07:47 AM
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Here is a link to the 2012 charts.

https://bicycles.stackexchange.com/qu...fferent-series

You are right about the FD.
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Old 06-13-12, 07:57 AM
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So, does that mean I could run Ultegra Shifters, with a Dura Ace Front Deraillaur, Ultegra rear durailer, and Dura Ace Crank?
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Old 06-13-12, 08:10 AM
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Originally Posted by lung View Post
So, does that mean I could run Ultegra Shifters, with a Dura Ace Front Deraillaur, Ultegra rear durailer, and Dura Ace Crank?
No. Refer to the compatiblity charts:




You are able to run Ultegra Shifters ONLY with Ultegra FD, RD is compatible.
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Old 06-13-12, 08:30 AM
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OK, if I'm reading this right, I had it backwards. So, 6700 shifters with 6700 FD and 7900 RD, and 7900 Crank would work until I could get the 7900 Shifters, FD, etc.
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Old 06-13-12, 08:41 AM
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Originally Posted by lung View Post
So, does that mean I could run Ultegra Shifters, with a Dura Ace Front Deraillaur, Ultegra rear durailer, and Dura Ace Crank?
The only possible issue is the DA FD with the ultegra shifters.


The reason for the compatiblity issue on shimano's chart I believe is that DA 7900 FD is designed to be trimless. Thus it may theoretically be a problem to use an Ultegra FD, with DA 7900 shifters. The opposite however, should not be a problem; you'll just have trim you don't need.

Also, Shimano often says things aren't compatible, or are outside spec, when in practice they work fine. It just means Shimano's not promising the particular combo will work.

So ultimately the answer is try it, and see if it works to your satisfaction.
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Old 06-13-12, 10:50 AM
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Originally Posted by merlinextraligh View Post
...DA 7900 FD is designed to be trimless. Thus it may theoretically be a problem to use an Ultegra FD, with DA 7900 shifters. The opposite however, should not be a problem; you'll just have trim you don't need...
I really wish my D/A front derailleur had trim like Ultegra has. Maybe I just need to learn how to adjust the FD better.
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Old 07-22-14, 03:46 AM
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Bringing up an old topic here but will a Dura Ace 7900 53/39 chainset work with Ultegra 6700 shifters?
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