Dura Ace 7800 Chainset Creak

On Wed, 03 Mar 2010 07:04:53 -0600, Mark Cleary
wrote:

Jobst Brandt wrote:
anonymous snipes:

Has anyone experienced and managed to solve a creaking sound coming
from this crank/BB combo? It is a characteristic creaking sound
which happens intermitently only under load.

Try your spell checker now and then.

I've taken everything apart, cleaned and relubed but to no avail.
The BB feels smooth and there is no play in it on inspection.
Chainring bolts have also been retightened. Pedals are also not the
issue as I tried two different sets.

OK, lets get down to hardware. Is it your chain (or chainset) that
creaks or your cranks? We can't hear it or put a load on it so you
had best find what is making the unwanted sound before trying to get
the rest of the world interested in your preferences.

Who are you anyway?

Jobst Brandt
Jobst,

Is it a bad day today? Maybe someday he might read your book.

Dear Mark,

OK, lets get down to Jobsts apostrophe checker.

It only fails now and then, usually when hes trying to get the rest of
the world interested in his preferences about spelling, grammar,
usage, net names, and black trucks.

Cheers,

Carl Fogel

On 3 Mar, 17:57, doa379 wrote:
Thanks for the input people.

Referring to your posts:

-- The frame is pretty new, there are no cracks in the frame. In fact
I had the same problem coming up using this very same crank on another
frame of the same/identical model. Frame is a Cannondale aluminium
with regular BB shell.

-- I haven't used teflon on the BB threads but have applied a fresh
amount of Lithium grease. The creak is still there.

-- Pedals are tight and in good shape. The creaking sound is
reproducable using another set of pedals. So it's not the pedals.

-- Chainring bolts have been lubed and are tight.

-- Having tried different wheels the creak is still there. So it's not
the dropouts. I understand sounds and creaks can appear to come from
somewhere when in fact the reason causing the issue can be totally
unrelated.

-- FD clamp is fine with no play there.

-- I swapped over between two chains I've been using. They are both
lubed and well maintained chains. The creak is still there.

-- Frame chasing: It's a fairly stock frame without any unusual
components. However, the creak was not present for a good while when
the frame/chainset was new. The creak only developed relatively
recently. Soon after the creaking started, I then swapped to run frame
with a 7900 chainset and BB, and then there was no creaking. Having
swapped back to the 7800 chainset, this creak has returned. So I am
not so sure whether the frame needs chasing.

Judging from the responses these are all fairly generic to identifying
a creaking problem. I was hoping someone would have encountered this
peculiar creak on this particular chainset before. I had another 7800
chainset prior to this one and that one remained silent.

Thanks again for the suggestions guys, keep them coming.

My first thought were towards the wheel, then, perhaps the bracket
shell itself may be cracked (or its joints). Hve not handled the
unit in question.

Jobst Brandt wrote:
OK, lets get down to hardware. *Is it your chain (or chainset) that
creaks or your cranks? *


"Chainset" is British for crankset.

Art Harris

On 03 Mar 2010 18:16:56 GMT, Jobst Brandt wrote:

Carl Fogel wrote:

anonymous snipes:

Has anyone experienced and managed to solve a creaking sound
coming from this crank/BB combo? It is a characteristic creaking
sound which happens intermitently only under load.

Try your spell checker now and then.

I've taken everything apart, cleaned and relubed but to no avail.
The BB feels smooth and there is no play in it on inspection.
Chainring bolts have also been retightened. Pedals are also not
the issue as I tried two different sets.

OK, lets get down to hardware. Is it your chain (or chainset) that
creaks or your cranks? We can't hear it or put a load on it so you
had best find what is making the unwanted sound before trying to
get the rest of the world interested in your preferences.

Who are you anyway?

He's a guy who wants help with his bicycle, which is creaking.

Oh! So that means he must post anonymously with no useful information
from which readers can make helpful suggestions.

He probably isn't interested in insults, spelling quibbles, or your
fake interest in his name.

What is insulting about asking a person to spell check?

He started the thread--at whom does your paranoia lead you to claim
that he's sniping?

Webster's:

1: to shoot at exposed individuals (as of an enemy's forces) from a
usually concealed point of vantage.

Shooting from concealment is sniping as is posing vague questions on a
newsgroup under a pseudonym. I guess this is all part of "modern"
social behavior, like driving around in a big black truck with heavily
tinted windows or bicycling with dark glasses even in dark weather.

Jobst Brandt

Dear Jobst,

I'm glad to hear that you feel that you're not insulting people who
ask polite questions by calling them snipers and blathering about
their spelling.

It's good to know that you really can't help it.

Please be sure to demand the name, rank, and serial number of all
posters whom you believe to be snipers.

Please check your posts for missin' apostrophes before whining about
spell checking.

And thanks for showing us that you can drag those big black trucks
that worry you so much into any thread.

Cheers,

Carl Fogel

On 3 Mar, 21:27, wrote:
On 03 Mar 2010 18:16:56 GMT, Jobst Brandt wrote:



Carl Fogel wrote:

anonymous snipes:

Has anyone experienced and managed to solve a creaking sound
coming from this crank/BB combo? *It is a characteristic creaking
sound which happens intermitently only under load.

Try your spell checker now and then.

I've taken everything apart, cleaned and relubed but to no avail.
The BB feels smooth and there is no play in it on inspection.
Chainring bolts have also been retightened. *Pedals are also not
the issue as I tried two different sets.

OK, lets get down to hardware. *Is it your chain (or chainset) that
creaks or your cranks? *We can't hear it or put a load on it so you
had best find what is making the unwanted sound before trying to
get the rest of the world interested in your preferences.

Who are you anyway?

He's a guy who wants help with his bicycle, which is creaking.

Oh! *So that means he must post anonymously with no useful information
from which readers can make helpful suggestions.

He probably isn't interested in insults, spelling quibbles, or your
fake interest in his name.

What is insulting about asking a person to spell check?

He started the thread--at whom does your paranoia lead you to claim
that he's sniping?

Webster's:

1: to shoot at exposed individuals (as of an enemy's forces) from a
* usually concealed point of vantage.

Shooting from concealment is sniping as is posing vague questions on a
newsgroup under a pseudonym. *I guess this is all part of "modern"
social behavior, like driving around in a big black truck with heavily
tinted windows or bicycling with dark glasses even in dark weather.

Jobst Brandt

Dear Jobst,

I'm glad to hear that you feel that you're not insulting people who
ask polite questions by calling them snipers and blathering about
their spelling.

It's good to know that you really can't help it.

Please be sure to demand the name, rank, and serial number of all
posters whom you believe to be snipers.

Then shoot them for being pies,


Please check your posts for missin' apostrophes before whining about
spell checking.

And thanks for showing us that you can drag those big black trucks
that worry you so much into any thread.

Cheers,

Carl Fogel

On Mar 3, 12:57*pm, doa379 wrote:
Thanks for the input people.

Referring to your posts:

-- The frame is pretty new, there are no cracks in the frame. In fact
I had the same problem coming up using this very same crank on another
frame of the same/identical model. Frame is a Cannondale aluminium
with regular BB shell.

-- I haven't used teflon on the BB threads but have applied a fresh
amount of Lithium grease. The creak is still there.

-- Pedals are tight and in good shape. The creaking sound is
reproducable using another set of pedals. So it's not the pedals.

-- Chainring bolts have been lubed and are tight.

-- Having tried different wheels the creak is still there. So it's not
the dropouts. I understand sounds and creaks can appear to come from
somewhere when in fact the reason causing the issue can be totally
unrelated.

-- FD clamp is fine with no play there.

-- I swapped over between two chains I've been using. They are both
lubed and well maintained chains. The creak is still there.

-- Frame chasing: It's a fairly stock frame without any unusual
components. However, the creak was not present for a good while when
the frame/chainset was new. The creak only developed relatively
recently. Soon after the creaking started, I then swapped to run frame
with a 7900 chainset and BB, and then there was no creaking. Having
swapped back to the 7800 chainset, this creak has returned. So I am
not so sure whether the frame needs chasing.

Judging from the responses these are all fairly generic to identifying
a creaking problem. I was hoping someone would have encountered this
peculiar creak on this particular chainset before. I had another 7800
chainset prior to this one and that one remained silent.

Thanks again for the suggestions guys, keep them coming.

OK, so if the bike does *not* creak with the 7900 but *does* creak
with the 7800, there's something about that particular crank and/or
chainrings that is creaking.

- did you put a little grease on the "splines" of the BB when you
pressed the crank arms on? Crank bolts torqued to spec? No evident
fretting or wear on the internal "spline" of the crank arms?

- double check chain ring bolts, R&R with light coat of grease or anti-
seize, carefully inspect chainrings for cracks

that's all I got...

nate