knocking from rear hub/cassette area
al_f...@my-deja.com
rear hub/cassette area. It's a triple front crank with a 9 speed cassette,
and when I am riding hard uphill, I hear a fairly loud "knocking" sound
coming from this rear area. I know there are a lot of different sounds bikes
make when they are experiencing problems, but the best I can describe the
sound is a deep "knock" rather then a clicking, or ticking, or creaking
sound. This only happens when I'm using the 4 or 5 largest rear cogs. Also,
there is an associated reverberation through the frame when the knocking is
really loud.
One thing I've noticed is that the cassette has some "tilt" play in it (when
cassette parallel to floor, cassette has left-right/up-back tilting play). I
would guestimate the amount of play is +- 1.5mm approximately, so about 3mm
total left-right or up-back play. I don't know if this has anything to do
with it. I've removed the cassette, greased the splined cassette body, and
securely retightened the lockring, but the noise persists.
Any help on this problem would be much appreciated,
Allan_
Sent via Deja.com http://www.deja.com/
Before you buy.
Bob Mitke
>Hi, I recently got a new road bike and I'm experiencing a problem with the
>rear hub/cassette area. It's a triple front crank with a 9 speed cassette,
>and when I am riding hard uphill, I hear a fairly loud "knocking" sound
>coming from this rear area. I know there are a lot of different sounds bikes
>make when they are experiencing problems, but the best I can describe the
>sound is a deep "knock" rather then a clicking, or ticking, or creaking
>sound. This only happens when I'm using the 4 or 5 largest rear cogs.
Also,
>there is an associated reverberation through the frame when the knocking is
>really loud.
>
>One thing I've noticed is that the cassette has some "tilt" play in it (when
>cassette parallel to floor, cassette has left-right/up-back tilting play). I
>would guestimate the amount of play is +- 1.5mm approximately, so about 3mm
>total left-right or up-back play.
You didn't buy a Cannondale with a CODA wheelset did you?
The knocking is probably not related to your loose freehub. To fix the
sloppy freehub you need to remove some shims inside the free hub to allow
for the bearing races to run closer together. Unless you are a skilled
mechanic, you had best let your LBS take care of this for you...
As for the knock, disassemble your hub and check for rubbing on your
axle at the base of where the free hub fixing bolt threads into the hub body...
If you have a CODA wheelset, I bet there is a nice line engraved in
your axle that doesn't go all the way around...
Let me know if my guess was right...
-Bob Mitke
David L. Johnson
>
> Hi, I recently got a new road bike and I'm experiencing a problem with the
> rear hub/cassette area. It's a triple front crank with a 9 speed cassette,
> and when I am riding hard uphill, I hear a fairly loud "knocking" sound
> coming from this rear area. I know there are a lot of different sounds bikes
> make when they are experiencing problems, but the best I can describe the
> sound is a deep "knock" rather then a clicking, or ticking, or creaking
> sound. This only happens when I'm using the 4 or 5 largest rear cogs. Also,
> there is an associated reverberation through the frame when the knocking is
> really loud.
It sure sounds like it sounds like a broken axle. But I presume you would
notice that when you took the wheel off to remove the cassette. Like, when
you removed the QR, half the axle didn't fall off, did it? Spin the axle
around. Does it wobble?
--
David L. Johnson david....@lehigh.edu
Department of Mathematics http://www.lehigh.edu/~dlj0/dlj0.html
Lehigh University
14 E. Packer Avenue (610) 758-3759
Bethlehem, PA 18015-3174
"What am I on? I'm on my bike, six hours a day, busting my ass. What are you
on?"
--Lance Armstrong
Qui si parla Campagnolo
rear hub/cassette area >>
and when I am riding hard uphill, I hear a fairly loud "knocking" sound
coming from this rear area. >>
Take it back to where you got it-could be a loose cogset, a toasted freehub
body-
Doubt it has anything to do with removing 'shims', like was metioned-if on a
shimano hub-
Peter Chisholm
"Vecchio's" Bicicletteria
1833 Pearl ST.
Boulder, CO
(303)440-3535
http://www.vecchios.com
Bob Mitke
><< Hi, I recently got a new road bike and I'm experiencing a problem with the
>rear hub/cassette area >>
><< It's a triple front crank with a 9 speed cassette,
>and when I am riding hard uphill, I hear a fairly loud "knocking" sound
>coming from this rear area. >>
>
>Take it back to where you got it-could be a loose cogset, a toasted freehub
>body-
>Doubt it has anything to do with removing 'shims', like was metioned-if on a
>shimano hub-
When was the last time you disassembled a CODA hub Peter? If you have
ever done this, you would know that the freehub is made in Taiwan, and
uses shims to adjust the play out of the internal bearings... They also like
to
broach the fixing bolt hex offcenter (which makes the clearance around the axle
nearly vanish) so that when large pedal loads are occurring when using the
small cogs a large bending moment is placed on the axle... Rubbage ensues
between the axle and the end of the freehub fixing bolt on an intermittent
basis. It kind of sounds like a knocking...
My money is on a CODA hub with an off center hex broach on the
freehub which causes axle rub under large pedal induced bending
moments...
To fix the problem you get a new freehub, or slap the axle on the lathe
and turn it down...
-Bob Mitke
Mike Jacoubowsky
shims.
It's kinda interesting, all the conjecturing going on, without anyone
knowing what type of hub it really is. Guess that's my next step...
--Mike-- Chain Reaction Bicycles
http://www.ChainReactionBicycles.com
"Bob Mitke" <bikes...@aol.comnojunk> wrote in message
news:20000912094045...@ng-fp1.aol.com...
Mike Jacoubowsky
--Mike-- Chain Reaction Bicycles
http://www.ChainReactionBicycles.com
<al_f...@my-deja.com> wrote in message news:8pk7q2$5n8$1...@nnrp1.deja.com...
bobm...@my-deja.com
vecc...@aol.com (Qui si parla Campagnolo) wrote:
> Take it back to where you got it-could be a loose cogset, a toasted
freehub
> body-
> Doubt it has anything to do with removing 'shims', like was metioned-
if on a
> shimano hub-
>
Petey forgot to quote the original 'shims' reference (conveniently, I
might add). Here is my original quote:
>>The knocking is probably not related to your loose freehub. To fix
>>the sloppy freehub you need to remove some shims inside the free hub
>>to allow for the bearing races to run closer together. Unless you
>>are a skilled mechanic, you had best let your LBS take care of this
>>for you...
I too have agreed that the knocking noise is probably not due to your
sloppy freehub. I simply provided a method to remedy "sloppy freehubs"
for the CODA brand...
Removing the shims internally on the CODA freehubs (KT manufactured) is
completely analagous to screwing the cone further down the axle on
loose ball bearing hubs... Fewer shims means closer bearing races
means less slop...
It ain't rocket science (unless you have never disassembled a freehub
before - which is why I recommended you let your LBS take care of that
problem for you)...
-Bob "Thanks for following orders regarding private emails to my
account Mr. Vechio" Mitke
Gocycle
}}}}}GoCycle}}}}}
Qui si parla Campagnolo
>shimano hub- >>
Please read my posts completely before going high order there Bob.
Your post was confusing about shims and then you mentioned Coda hubsets-
I was talking about shimano hubsets.
I just rebuilt a wheelset using Cida hubsets so I guess it would be Monday-
<< To fix the problem you get a new freehub, or slap the axle on the lathe
and turn it down... >>
There's a practical solution, now wherer did I leave my lathe??
Qui si parla Campagnolo
account Mr. Vechio" Mitke >>
That's 'VECCHIO'-Mr. Mitkke
Bob Mitke
>I just rebuilt a wheelset using Cida hubsets so I guess it would be Monday-
Did you disassemble the freehub body itself? If you did, then you know
exactly what shims I am referring to. If you didn't, then maybe you should
check it out the next time you have a chance...
-Bob Mitke
al_f...@my-deja.com
"Mike Jacoubowsky" <Mik...@ix.netcom.com> wrote:
> What type of hub is it?
>
> --Mike-- Chain Reaction Bicycles
> http://www.ChainReactionBicycles.com
>
Hmm, this is the third time I've tried to post a reply, and each time I
come back, my reply is not there...well, hope this time it works.
Anyway, its a Shimano 105 hub.
Let me throw out this other theory I had. I thought maybe the problem
could be due to a hub that was adjusted too tightly. Could that cause
the problem, if the cones were too tight against the bearings,
especially after squeezing down the QR? I tried testing the theory by
loosening the QR but leaving the wheel on, and the noise did seem to
lessen. But it was only marginal, and I'm thinking maybe that was due
to the fact that the QR was not locked and the noise wasn't
reverberating through the frame. But, I don't know how to adjust my hub
since it is a sealed bearing cartridge hub. There is no place to use my
cone wrenches.
I guess my last option is to go back where I got it and request a
replacement hub.