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Old 02-27-06, 10:30 AM   #1
Olebiker
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Noise only when in middle cogs

My road bike is set up with Campagnolo Centaur 3 X 10. Recently it started making noise as if the rear derailleur was not adjusted correctly. The noice would only occur in about three of the cassette cogs in the middle of the cassette. The noise only occurs when I am pushing hard, so I have not been able to duplicate it while the bike is on the repair stand.

I replaced the chain. The noise continued. I replaced the cassette and the noise continued. It happens on both the the large and small chainring. I am totally bumfuzzled.
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Old 02-27-06, 10:41 AM   #2
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Quote:
Originally Posted by Olebiker
My road bike is set up with Campagnolo Centaur 3 X 10. Recently it started making noise as if the rear derailleur was not adjusted correctly. The noice would only occur in about three of the cassette cogs in the middle of the cassette. The noise only occurs when I am pushing hard, so I have not been able to duplicate it while the bike is on the repair stand.

I replaced the chain. The noise continued. I replaced the cassette and the noise continued. It happens on both the the large and small chainring. I am totally bumfuzzled.
How long did you ride it after replacing the chain before replacing the casstte? If the cassette and chain were both toasted, you should have replacet them both at once.

If you put on a goodly number of miles with a new chain on a worn cassette, the chain would wear very rapidly to match the worn sprockets.

Since you live in Florida, it wouldn't be surprising if most or all of your sprocket wear was to the middle three sprockets.

My advice is to measure the chain for 'stretch' as explained at:

http://sheldonbrown.com/chains

Sheldon "Simultaneity" Brown
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| One measurement is worth 50 expert opinions |
| --Howard Sutherland |
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Old 02-27-06, 10:52 AM   #3
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Have you made any adjustments to the rear derailleur's cable tension? Your FL address makes me thing you ONLY use the middle cogs so a mis-adjusted rd would also account for the noise.
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Old 02-27-06, 11:36 AM   #4
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Have you made any adjustments to the rear derailleur's cable tension? Your FL address makes me thing you ONLY use the middle cogs so a mis-adjusted rd would also account for the noise.
Sure have. It only makes the noise while under a heavy load. If I am just spinning along, it is quiet.
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Old 02-27-06, 11:42 AM   #5
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How long did you ride it after replacing the chain before replacing the casstte? If the cassette and chain were both toasted, you should have replacet them both at once.
I only rode about fifty miles with the new chain before replacing the cassette. When I took the old chain off and measured it there was little if any stretch. The cassette only had about 3,000 miles on it.
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Old 02-27-06, 11:55 AM   #6
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Are you using enough torque when you tighten the lockring?
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Old 02-27-06, 12:01 PM   #7
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Are you using enough torque when you tighten the lockring?
<sheepish> I don't know. I don't have a torque wrench (yet). I guess I had better get one. Do you think that might be the problem? </sheepish>
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Old 02-27-06, 01:08 PM   #8
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<sheepish> I don't know. I don't have a torque wrench (yet). I guess I had better get one. Do you think that might be the problem? </sheepish>
The reason I asked is because my one experience with a noisy cassette, mostly middle cogs, was due to low torque on the lockring. A torque wrench would be good but is not required. You can try tightening it to see if that eliminates the noise. The torque spec is probably shown on the lockring. It needs quite a bit of torque.

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Old 02-27-06, 01:41 PM   #9
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Originally Posted by Al1943
The reason I asked is because my one experience with a noisy cassette, mostly middle cogs, was due to low torque on the lockring. A torque wrench would be good but is not required. You can try tightening it to see if that eliminates the noise. The torque spec is probably shown on the lockring. It needs quite a bit of torque.

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Old 02-27-06, 01:49 PM   #10
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OK, you've already swapped out the most likely culprits. When you mention that it is only when you go hard it makes me think of a chain-mesh sound. You mentioned that it sounds as though the rd is not adjusted...

Is is a higher pitched - "whirrrrrrrrrrrrrrr" or a "clickity-clickity-clickity", or more like a "ooooooooooooooooaklahoma where the ...."
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Old 02-27-06, 07:12 PM   #11
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OK, you've already swapped out the most likely culprits. When you mention that it is only when you go hard it makes me think of a chain-mesh sound. You mentioned that it sounds as though the rd is not adjusted...

Is is a higher pitched - "whirrrrrrrrrrrrrrr" or a "clickity-clickity-clickity", or more like a "ooooooooooooooooaklahoma where the ...."
More of a "whirrrrrrrrr".

I'm going to be out of town for the rest of the week but I will buy a torque wrench Saturday and put the old German torque on it. You know, gutentight.
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Old 02-27-06, 07:55 PM   #12
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More of a "whirrrrrrrrr".

I'm going to be out of town for the rest of the week but I will buy a torque wrench Saturday and put the old German torque on it. You know, gutentight.
Unless you just want a torque wrench I'd say tighten it with a 12" wrench to see if that cures the noise.
Chains go "whirrrrr". Loose cassettes go "clinkety clank".

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