Campagnolo Chorus 11 Lockring problem

Discuss light weight issues concerning road bikes & parts.
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logy
Posts: 123
Joined: Fri Jun 03, 2011 6:30 pm

by logy

Hi

Can anyone help with why the lockring keeps loosening? I torqued it up to spec and the bike is a month old. argh...


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Valbrona
Posts: 1484
Joined: Fri Oct 28, 2011 3:25 am
Location: United Kingdom of Great Britain and Northern Ireland

by Valbrona

1/ Clean up and check both sets of threads for damage.

2/ Try another lockring. Could just be that the threads were cut poorly, but probably not.

3/ Exceed stated torque until it holds and/or use threadlock.

by Weenie


logy
Posts: 123
Joined: Fri Jun 03, 2011 6:30 pm

by logy

Over torqued slightly now and all threads checked and ok. Fingers crossed.


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Valbrona
Posts: 1484
Joined: Fri Oct 28, 2011 3:25 am
Location: United Kingdom of Great Britain and Northern Ireland

by Valbrona

Assuming here that the cassette body has not come loose. When that happens the cassette lockring can be tight, but if you pull on the sprockets they can shift sideways so that the lockring contacts with the RH dropout.

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kbbpll
Posts: 408
Joined: Wed Oct 20, 2010 5:56 am

by kbbpll

If you've over-torqued the lock ring, next time cassette is apart check if the spacer between 6 & 7 cogs is busted. Mine was the first time I took it apart to clean (having never torqued it myself), so shop warrantied it and said Campy changed the spec from 40 Nm to 15 because of this (but I've never read that anywhere else so shop could have been BS-ing me).

There are two different 12T sprockets, one for cassettes starting with 12T and a different one that goes below the 11T. One has "knurling" (for the lock ring) and the other doesn't. There also appear to be two different lock rings in the parts catalog (http://www.campagnolo.com/media/files/0 ... part_B.pdf) - CS-112, and CS-111 "for Z 11", which I presume means 11T as the first sprocket. They certainly look different in the diagrams. I don't know if the cassette can even be assembled properly with the wrong 12T or wrong lock ring, but maybe there was some mix-up with these?

You don't state what your ratio is but if it's 12-something and you don't have the knurled 12T I can see where the lock ring might loosen. I'm not a mechanic, just speculating.

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bikerjulio
Posts: 1901
Joined: Fri Dec 11, 2009 10:38 pm
Location: Welland, Ontario

by bikerjulio

certain lack of info.

was this a brand new, never messed with, bike and cassette? are you sure?

which cassette is it?

how did you know it was loose?

are you sure it's not a loose freehub?

what torque spec did you use?

have you checked the spacers?

I have always used gentle torque on my lockrings and never a problem.

I have a ham-fisted friend who took delivery of a brand new Campy wheelset, overtorqued the lockring, stripped the threads, and was then in immediate need of a new freehub. Don't be that guy.
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM

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kman
Posts: 1091
Joined: Wed Jul 13, 2005 10:51 am
Location: Sydney, Australia

by kman

There are definitely different lock rings for different campagnolo cassettes.

Answers to the above will help.
You can't be a real country unless you have a beer and an airline. It helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer.
-- Frank Zappa

by Weenie


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