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PostPosted: Wed Nov 07, 2012 2:39 am 
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Joined: Mon Oct 22, 2012 5:30 am
Posts: 22
Location: Santa Monica, ca
I have a 12-27 dura ace freewheel on my bike and wanted to shift to a 11t cog but the cog i bought slips badly and I am wondering if there is a different look nut needed to get this to work.
I am running a 10spd sram chain and xtr derailleur with the setup. The dura ace freewheel and chain are new as is the 11t cog.

Is there any reason this thing isn't working?

sorry if this has been addressed in the past I couldn't find any posts.

Ken


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Posted: Wed Nov 07, 2012 2:39 am 


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PostPosted: Wed Nov 07, 2012 5:03 am 
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Joined: Sun Jun 12, 2005 10:56 am
Posts: 2669
Location: New Zealand
11T cogs need 11T lockrings....yes.

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PostPosted: Wed Nov 07, 2012 7:07 am 
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Joined: Wed Jan 18, 2012 4:23 pm
Posts: 619
Location: Midlands, United Kingdom
Its the cassette you changed not the freewheel (which you don't have!)

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PostPosted: Thu Nov 08, 2012 2:59 am 
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Joined: Mon Oct 22, 2012 5:30 am
Posts: 22
Location: Santa Monica, ca
yes indeed you are right the cassette! I have been also shopping for freewheels for another bike my mistake! I will search for a lock ring for 11t. Thanks for the info.

Ken


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PostPosted: Thu Nov 08, 2012 3:43 am 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
If all you're doing is taking off the 12tooth cog and replacing it with the 11tooth cog, there is one issue besides the lockring size. An 11tooth cog has a wider built-in spacer than other cogs. The extra width is intended to sit in the recess of the 12tooth cog. Without that, the spacing will be off, you may get chain noise in the 11tooth, shifting to the 12tooth may be poor, the chain may even rub your dropout.
Again, if the main goal is to get an 11tooth cog on there, keep the 12tooth cog and remove the 13tooth instead.


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