Dura ace 10 derailluer compatable with 9?
09-25-06, 10:54 PM
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Dura ace 10 derailluer compatable with 9?
Maybe this has already been discussed but I cant find it. I hear the new 10 speed rd-7800 is compatable with 9 speed shifters. BUT, I also hear that it does not work well, especially with a 27 tooth cog. Has anyone tried the new derailluer with like a sram 12-26? New rd-7700s are next to impossible to find (yes I am aware they dont make them anymore)so I guess someone is sitting on a bunch of them waiting for the right moment on ebay. Or shimano was exceptionally thourough in recalling the remaining ones out there.
09-25-06, 10:56 PM
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I am currently using a RD-7800 with a 12-27 CS-7700 with zero problems. Works just fine.
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09-25-06, 10:57 PM
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yup. works fine. i have a 7800 RD and 9sp shifters.
*i don't run a 27t cog though, so i can't 100% sure of your situation.
*i don't run a 27t cog though, so i can't 100% sure of your situation.
09-25-06, 10:57 PM
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The D/A 10s derailler will be fine, even with a 27 cog. Whoever you "heard" that from probably did not have it properly adjusted. It will also work just with SRAM (and other Shimano-compatible) cassettes.
09-25-06, 11:09 PM
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Originally Posted by 'nother
The D/A 10s derailler will be fine, even with a 27 cog. Whoever you "heard" that from probably did not have it properly adjusted. It will also work just with SRAM (and other Shimano-compatible) cassettes.
09-25-06, 11:56 PM
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I think it says on the rear derailleur box: "9 and 10 speed compatible"
I'm using a 10sp RD with 9sp shifters, and it works great, but I don't have a big cog
I'm using a 10sp RD with 9sp shifters, and it works great, but I don't have a big cog
Last edited by 531Aussie; 09-26-06 at 08:49 AM.
09-26-06, 12:02 AM
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Hmmm... Shimano is pretty particular about making their shifting as smooth as possible. And they do sell a 12-27 CS-7800. I can't see them releasing a rear derailleur that won't nicely shift a 27T cog when they sell a cassette for that group with a 27T cog.
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09-26-06, 05:51 AM
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I'm missing something here: with this kind of set-up, do you have 10 usable gears in the back or just 9, because that's all the shifter allows? If the latter, is it a prelude to ultimately upgrading to 10-speed brifters?
09-26-06, 06:05 AM
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Could one in theory use 10 speed brifters, cassette, cranks, and chain with 9 speed derailleurs?
09-26-06, 06:25 AM
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Originally Posted by 531Aussie
I think it says on the rear derailleur box: "9 and 10 speed compatible"
I'm using a 10sp RD with 9sp shifters, and it works grerat, but I don't have big cog
I'm using a 10sp RD with 9sp shifters, and it works grerat, but I don't have big cog
Last edited by roadpig2001; 09-26-06 at 07:14 AM.
09-26-06, 06:38 AM
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Originally Posted by jamiewilson3
Could one in theory use 10 speed brifters, cassette, cranks, and chain with 9 speed derailleurs?
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09-26-06, 08:30 AM
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Originally Posted by roadpig2001
I thought I would check where the knowledge base is deeper.
Check out the Bicycle Mechanics subforum, too.It'll work just fine. Derailers don't really have "speeds" ... their position is controlled by the shifters. You could use almost any relatively modern derailer (8, 9, 10s) and it will work fine. The main thing is that the shifters match the # of cogs (but even so, there are some tricks for mixing 10s shifters with a 9s casssette).
09-26-06, 08:51 AM
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Originally Posted by chzman
i dislike the word 'brifters'
Hate it. We all know what "shifters", "STIs", and "ergo levers" are
09-26-06, 09:49 AM
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Sorry to insight all of the hatred of the word brifters, I will try to accomodate.
Thanks for the sheldon brown link about brifters. That is what I thought about the brifters. I just wondered if there was a cam in the brifter/RD combo that would cause each click to be off when doing a hybrid 9/10 speed brifter/RD combo. After reading and doing some of my own research, it is true that the brifters, cassette, and chain are the only things that need to be changed for a 9 to 10 conversion. The 7700 cranks do actually work with either.
Thanks for the sheldon brown link about brifters. That is what I thought about the brifters. I just wondered if there was a cam in the brifter/RD combo that would cause each click to be off when doing a hybrid 9/10 speed brifter/RD combo. After reading and doing some of my own research, it is true that the brifters, cassette, and chain are the only things that need to be changed for a 9 to 10 conversion. The 7700 cranks do actually work with either.
