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Cassette locknnut question...(9 posts)

Cassette locknnut question...5ive
May 10, 2002 8:03 AM
I have campy 10 speed cassettes with Nucleon wheelset. The locknut that secures the cassettes to the hub body will come loose every other week or so. I keep tightening it back but it does not stay put. Is this considered normal or is there something I can do to keep it from coming loose?
teflon plumbers tape on the threads of the locknut!(nm)merckx56
May 10, 2002 10:12 AM
Tighten it?TJeanloz
May 10, 2002 10:43 AM
If it's coming loose, there's no way you're clamping it down enough. Torque spec is (I believe) 50 Nm- which is pretty much defined as: "as tight as you can get it with a wrench 12" long". Tight. It won't shake loose.
Tighten it?5ive
May 10, 2002 11:49 AM
Thanks for the response and the torque specs. I'm beginning to think that maybe there's something wrong with the locknut in question. The first time I've noticed this, I've taken it to the shop and they've assured me that it should never come loose again. But it still comes loose about every other week or so and I need to retighten it. Could there be anything that I'm doing that could be causing this? I've been told by the shop owner that I have a tendency to overtighten the skewer too. Do you think it could be related? Thanx in advance.
I don't think so...TJeanloz
May 10, 2002 12:09 PM
Frankly, I can't imagine that it could possibly come loose if it were torqued to spec. There is no turning force on the lockring, just vibration- and I don't think you could shake it loose. Tighten it as tight as you can is my only advice.
Thanx (nm)5ive
May 10, 2002 12:31 PM
Is it the right size????JohnG
May 10, 2002 6:30 PM
There are 2 different Campy C10 lockrings. The small one designed for the 11 cog and the larger one designed for the 12 or 13 cog.

If you are using the small lockring on a 12 or 13 cog you will experience major problems. The lockring should fit be VERY near to the inside edge of the cog. There are little serations on the lockring that should "engage" the serations on the cog.

Is it the right size????5ive
May 13, 2002 5:16 AM

I just want to clarify something. When you are talking about 2 different sizes, are you talking about a lock'ring' or a lock'nut'? The problem in question with my wheel is with lock'nut'.
same partJohnG
May 13, 2002 6:57 AM
Yes, we're talking about the same part. It's usually called a lock'ring but lock'nut is just as good a name. It's the splined nut that secures the cassette to the hub.

Look VERY carefully at the outside diameter of the lock'nut/ring and see if it's 'near' snugg against the inside edge of the little step in cog. If you have the small lock'nut/ring there will be a little gap and the serations on the nu/ring will not engage the serations on the cog properly. BTW: You should feel the serations on the lock'nut/ring biting into the seratiojns on the cog when you tighten the nut.

BTW: the torque specs that Campy calls for seem VERY high to me on this part. I usually just put about 20 ft/lbs on the nut/ring and never have a problem. If you have the correc lockring then just put a little more torque on it..... I can't remember the exact # but I think the factory torque is around 40 ft/lbs.

good luck