Question about Shimano Dura Ace CS-7900

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Hi i fitted a CS-7900 to a 10speed freehub. the shimano instructions say install the spacer to the "9speed freehub" but there is not mention of if it is needed or not when fitting to a 10 speed. Hope you can help. Mark

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So, the answer is maybe. Not all freehubs are the same. Some 10spd freehubs do and some don't. If your not having a binding problem with your freehub and when the rear derailleur is lined up with the lowest (inside) cog and it's not hitting your spokes then it's good. if either of these things happen install the spacer.

Posted on Mar 25, 2011

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Posted on Jan 02, 2017

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Good day guys, i would like to ask if it is possible to repair the "shimano dura ace cs-7900" and those other shimano rear speed sprocket? because my speed gear wasn't working. thanks guys.....


What's not working about it? It has NO MOVING parts.

You can find details for it and everything Shimano at http://techdocs.shimano.com/techdocs/index.jsp
Chain issues maybe?

http://sheldonbrown.com/chains.html

Derailleur adjustment? Get focused in if you want specific help.

This resource covers a lot...

http://www.parktool.com/blog/repair-help


Search engines "how to..." also find a lot of procedures in video form.

Jul 14, 2011 | Shimano Dura Ace CS-7900

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Which way round


you place it between 1and 2 or at the end of the of the sprocket don't worry about that just install it

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Need to replace the cassette body on my Ksyrium SL wheel. Is there a tech sheet on this procedure?


You need two tools: a cassette wrench or socket (it's a splined socket that fits into the cassette through the axle)and a chain whip wrench. You use the chain whip by wrapping it around one of the cogs of the cassette to immobilize it and then loosen the lock nut of the cassette with the cassette wrench. It is just like a screw or bolt. The Cassette needs to be lined up with the splines on the freehub. Find the thin spline and use it as your "key" because it is the only one that width. Then drop the new cassette on to the freehub and re-torque the cassette's lock ring. If the cassette is disassembled rather than one piece, from the largest cog first on the bottom, alternate between cogs and spacers until you are out of spacers. The smallest cogs have these cast in. As you take the old one off, the installation technique is the same in reverse.

Regards,
matt

Sep 14, 2009 | Mavic Cycling

1 Answer

HELLO, I HAVE A DURA ACE 7900 MODEL CASSETTE AND WOULD LIKE TO PUT IT ON A KSYRIUM SL RIM, DO I HAVE TO PUT THE SPACER ON IT BEFORE THE WHOLE CASSETTE GOES ON? THE CASSETTE IS A 12-25 GEAR.


In my experience with Shimano cassettes on Mavic wheels, the answer is "yes" but i had a mountain wheel and cassette. The only way to know is to put it on and see if there is slop in the fitment. If there is, then you have your answer. i also had this problem with Mavic: i had to adjust the high and low settings on my rear derailleur because of the awkward spacing of the Mavic freehub. Just something you should be aware of in case you have difficulty with shifting after the install. By the way - although they are inferior cassettes, SRAM cassettes seem to fit Mavic freehubs better.

Regards,
matt

Sep 14, 2009 | Cannondale Cycling

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