noise after chain change

Pierre Feller said:

Hi, No noise before the chain change and now a rhythmical metallic noise only running under
pressure (up a hill) and on the middle front blade (3 x 9 Campagnola Veloce/Daytona)and on the 4
largest cogs. The new Campagnola C9-chain runs and shifts smoothly - I checked out each link - on
the work-support. The cassette is new, the 3 front-blades have about 7'000 km. This is my second
chain change. What could it be ? Thanks for your advice, Pierre

Gear wear. The spacing is no longer one inch for 2 teeth, but your new chain is. They may look fine,
but they're worn a little further apart. If the noise isn't bad, I'd just let the chain wear into
the gears -- as long as it doesn't skip under load.

David

"David Kunz" <[email hidden]> wrote in message
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Quoted message said:

Pierre Feller said:

Hi, No noise before the chain change and now a rhythmical metallic noise only running under
pressure (up a hill) and on the middle front blade (3 x 9 Campagnola Veloce/Daytona)and on the 4
largest cogs. The new Campagnola C9-chain runs and shifts smoothly - I checked out each link -
on the work-support. The cassette is new, the 3 front-blades have about 7'000 km. This is my
second chain change. What could it be ? Thanks for your advice, Pierre

Gear wear. The spacing is no longer one inch for 2 teeth, but your new chain is. They may look
fine, but they're worn a little further apart. If the noise isn't bad, I'd just let the chain wear
into the gears -- as long as it doesn't skip under load.

Except he said the cassette is new, too. I'm guessing the new chain has a rivet sticking out a hair
(hence, "rhythmical" noise).

Bill "check where chain was broken first" S.

"Sorni" <[email hidden]> wrote in message
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Quoted message said:

"David Kunz" <[email hidden]> wrote in message
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Quoted message said:

Pierre Feller said:

Hi, No noise before the chain change and now a rhythmical metallic noise only running under
pressure (up a hill) and on the middle front blade (3 x 9 Campagnola Veloce/Daytona)and on the
4 largest cogs. The new Campagnola C9-chain runs and shifts smoothly - I checked out each link
- on the work-support. The cassette is new, the 3 front-blades have about 7'000 km. This is my
second chain change. What could it be ? Thanks for your advice, Pierre

Gear wear. The spacing is no longer one inch for 2 teeth, but your new chain is. They may look
fine, but they're worn a little further apart. If the noise isn't bad, I'd just let the chain
wear into the gears -- as long as it doesn't skip under load.

Except he said the cassette is new, too. I'm guessing the new chain has a rivet sticking out a
hair (hence, "rhythmical" noise).

Bill "check where chain was broken first" S.

Just re-read OP. Could be middle chainring wear, I suppose -- but why only in 4 largest cogs? Sounds
like it's related to ANGLE of chain?

Bill "aye, there's the rub, bub" S.

Sorni said:

"David Kunz" <[email hidden]> wrote in message
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Quoted message said:

Pierre Feller said:

Hi, No noise before the chain change and now a rhythmical metallic noise only running under
pressure (up a hill) and on the middle front blade (3 x 9 Campagnola Veloce/Daytona)and on the 4
largest cogs. The new Campagnola C9-chain runs and shifts smoothly - I checked out each link - on
the work-support. The cassette is new, the 3 front-blades have about 7'000 km. This is my second
chain change. What could it be ? Thanks for your advice, Pierre

Gear wear. The spacing is no longer one inch for 2 teeth, but your new chain is. They may look
fine, but they're worn a little further apart. If the noise isn't bad, I'd just let the chain wear
into the gears -- as long as it doesn't skip under load.

Except he said the cassette is new, too. I'm guessing the new chain has a rivet sticking out a
hair (hence, "rhythmical" noise).

Bill "check where chain was broken first" S.

He only has the noise on the front middle CR. I've had this happen -- that's what it has been on my
bike. And it's the gear the I use the most (I don't know about him), so it's the most likely to have
more wear than the others.

The chain just doesn't move fast enough for it to be a rhythmic noise unless quite a few of the
links are having problems, or the rhythm is more like a tic... ... ... ... tic ... ... ... tic.

But, for the original author... If your gears are wearing out this fast (only one or two chains),
you need to clean and lube it more often.

David

Sorni said:

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"David Kunz" <[email hidden]> wrote in message
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Pierre Feller wrote:

>Hi, No noise before the chain change and now a rhythmical metallic noise only running under
>pressure (up a hill) and on the middle front blade (3 x 9 Campagnola Veloce/Daytona)and on the 4
>largest cogs. The new Campagnola C9-chain runs and shifts smoothly - I checked out each link -
>on the work-support. The cassette is new, the 3 front-blades have about 7'000 km. This is my
>second chain change. What could it be ? Thanks for your advice, Pierre

Gear wear. The spacing is no longer one inch for 2 teeth, but your new chain is. They may look
fine, but they're worn a little further apart. If the noise isn't bad, I'd just let the chain
wear into the gears -- as long as it doesn't skip under load.

Except he said the cassette is new, too. I'm guessing the new chain has a rivet sticking out a
hair (hence, "rhythmical" noise).

Bill "check where chain was broken first" S.

Just re-read OP. Could be middle chainring wear, I suppose -- but why only in 4 largest cogs?
Sounds like it's related to ANGLE of chain?

Bill "aye, there's the rub, bub" S.

This is really the same thing that happened to me -- right down to it being the largest gears and
the middle CR. At the time, I was guessing that it was because these gears had their sides worn a
bit from the chain angle and from use (I climb a lot of hills). The new chain's laterally stiffer
and highlights this. But, my middle CR had too much wear to really confirm this by inspection.

I also swapped a new middle CR in and it went away. But hating to waste something that had useful
life in it (i.e., being the cheap skate that I am 🙂), I put the old CR back and it went away after
a bit (I don't remember how long it took).

David

Pierre Feller said:

No noise before the chain change and now a rhythmical metallic noise only running under
pressure (up a hill) and on the middle front blade (3 x 9 Campagnola Veloce/Daytona)and on the
4 largest cogs.

Is the "rhythmical metallic noise" once per pedal revolution? If so, it's not the fault of the
chain. Check to see if the chain is rubbing the front derailleur when pedaling hard (possibly due to
frame flex). Try trimming the front der.

Art Harris

David I think you are right: it is the front middle CR I use the most, but I always kept it clean
and lubrated, so for me it is a great question: why already wear out ? Ok my weight isn't the
slightest: 85 kg... Pierre

Pierre Feller said:

David I think you are right: it is the front middle CR I use the most, but I always kept it clean
and lubrated, so for me it is a great question: why already wear out ? Ok my weight isn't the
slightest: 85 kg... Pierre

It's usually one of 3 things: lube, cleaning, or waiting too long to replace the chain.

You feel that you keep your chain clean and well lubbed (been there, been disapointed 🙂). Do you
make sure to clean your cassette and chainrings when you clean the chain? Does your cleaning method
get in between the link plates where crud will wear the sides of the gears? Next time you think that
you're chain's still clean, feel the sides of the CR teeth and see if there's grit on them. This
will wear the sides and cause the problem that you're having.

You might consider changing to a different lube. I switched from a wet lube to finish line teflon
and my chain and gear life almost doubled. I'd expect similar results from other semi-dry lubes
(they go on thin to penetrate and set-up into a viscous thick film in 1-2 hours). Also, always wipe
off any extra lube. If you can get to it with a rag, it's not in the right place to reduce friction
🙂 -- all it'll do is collect dust and dirt that'll turn into grinding paste.

It could also be that you lube it when there's grit on it, but it may look fairly clean. This will
carry the grit into the chain where it can do the most damage.

Lastly, if you wait too long to replace the chain, it'll have damaged the cogs so that the new chain
does not fit them right -- the teeth spacing has worn to match the old chain and they're now too far
apart. The symptom here is usually skipping under power, not noise. But, the recommended chain
replacement time is when 6 full links (2 chain pieces) measures 6-1/16 to 6-1/8 inch. A new chain'll
be 6". Some people rotate between 3 chains so that they don't have to worry about this (what I've
started doing). All of the chains will wear about the same and the gears and cogs will match them.
When you do finally replace them, you just replace the whole driveline 🙂 (well, maybe considering
how often I use the big CR, I might get away with leaving it).

David