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"Actually you are the first person to bring up this issue"



 
 
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  #11  
Old March 19th 04, 04:48 PM
Frobnitz
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Default "Actually you are the first person to bring up this issue"


"James Annan" wrote in message
...
It's now a year since the QR/disk brake problem hit the headlines, and I
thought some of you might be interested in hearing how the manufacturers
are dealing with it.

....or not, as the case appears to be.

Have you contacted someone like Watchdog (UK consumer affairs program, for
the non-UK readers on the x-post) to see if they are interested. There has
been a reasonable amount of publicity /within the interested groups/, which
are, unfortunately, regarded as a weird minority by the public, but your
average Joe Punter who buys a supermarket y-frame full-sus brick won't have
read this, and poor though they may be, discs are starting to appear on
these - and the users may not know (how) to check that their QRs are tight.

E


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  #12  
Old March 19th 04, 05:37 PM
Sheldon Brown
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Jon Senior wrote:

With quick-release, if you have the skewers too tight, they can make the hub
bearings bind. Giant's bike manual suggested that the levers were too loose
if closing them didn't leave an imprint in my palm. Doing so meant the
wheels stopped rotating within about 3/4 revolution, compared to around 20
when loose.


That's only true if the hub bearings are misadjusted. With properly
adjusted quick-release hubs, there's slight looseness in the axle
bearings when the skewer is not connected, and when the skewer is
properly tightened, this slack is taken up without causing the bearings
to bind.

See: http://sheldonbrown.com/cones

Sheldon "Insert Nickname Here" Brown
+-------------------------------------------------+
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| of the ability to unlearn old falsehoods. |
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Phone 617-244-9772 FAX 617-244-1041
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  #13  
Old March 19th 04, 05:38 PM
Simon Daw
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Default "Actually you are the first person to bring up this issue"


"Jon Senior" jon_AT_restlesslemon.co.uk wrote in message
...
"bomba" wrote in message
news
On Fri, 19 Mar 2004 14:50:19 +0000, Peter B wrote:

Well I've not had a problem yet but I do make sure the standard

Shimano
skewers are very tight.


Is there such a thing as too tight? Is there a danger of the skewer
being over-stressed and being more likely to fail?


With quick-release, if you have the skewers too tight, they can make the

hub
bearings bind. Giant's bike manual suggested that the levers were too

loose
if closing them didn't leave an imprint in my palm. Doing so meant the
wheels stopped rotating within about 3/4 revolution, compared to around 20
when loose.

Jon


QR skewers certainly tighten the bearings, although it's something that's
always bemused me somewhat; how do they make so much difference when the
cones are locked onto a pretty un-compressable axle? I suppose it's just
that very, very little movement of the cones on the axle is required to make
a difference. Anyway, it's a normal effect, and needs to be taken account of
when setting the cones. There should actually be a little play before the QR
skewer is fastened. Not doing skewers up tightly isn't a good idea, although
I think the imprint in the palm is a *bit* extreme!


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  #14  
Old March 19th 04, 05:42 PM
Richard Bates
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Default "Actually you are the first person to bring up this issue"

On Fri, 19 Mar 2004 11:37:22 -0500, in
, Sheldon Brown
wrote:

Sheldon "Insert Nickname Here" Brown


Is this a competition?


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  #15  
Old March 19th 04, 05:45 PM
Pete Biggs
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Default "Actually you are the first person to bring up this issue"

Jon Senior wrote:

Is there such a thing as too tight? Is there a danger of the skewer
being over-stressed and being more likely to fail?


With quick-release, if you have the skewers too tight, they can make
the hub bearings bind. Giant's bike manual suggested that the levers
were too loose if closing them didn't leave an imprint in my palm.
Doing so meant the wheels stopped rotating within about 3/4
revolution, compared to around 20 when loose.


Cones can be loosened to compensate for a tighter skewer. In other words,
readjust so there's more play in the hub before QR is done up, to cope
with the greater axle compression when it is closed.
I don't think it's an issue for cartridge bearings.

This is besides the point though. There's obviously a fundamental problem
with the type of setup in question. Doing up the QR a bit tighter hardly
seems like a satisfactory solution.

~PB


  #16  
Old March 19th 04, 05:47 PM
S o r n i
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Default "Actually you are the first person to bring up this issue"

Richard Bates wrote:
On Fri, 19 Mar 2004 11:37:22 -0500, in
, Sheldon Brown
wrote:

Sheldon "Insert Nickname Here" Brown


Is this a competition?


Umm, if it is you lose.

Bill "as would I" S.


  #18  
Old March 19th 04, 05:59 PM
Alex Rodriguez
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Default "Actually you are the first person to bring up this issue"

In article ,
says...

Is there such a thing as too tight? Is there a danger of the skewer
being over-stressed and being more likely to fail?


Not if it is steel.
----------
Alex

  #19  
Old March 19th 04, 06:06 PM
Pete Jones
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Default "Actually you are the first person to bring up this issue"

On Fri, 19 Mar 2004 11:58:47 -0500, Alex Rodriguez
blathered:

It's now a year since the QR/disk brake problem hit the headlines, and I
thought some of you might be interested in hearing how the manufacturers
are dealing with it.


Well I've not had a problem yet but I do make sure the standard Shimano
skewers are very tight.
Also I've noticed the "Lawyer Lips" on my new Rockshox seem particularly
generous, I don't know if that's just a fluke or deliberate to help address
the (alleged) problem.


I have a front disc brake on my Van Dessel Super Fly. I've only had to
do really hard braking on one ocassion


http://vandesselsports.com/b_sfly.shtml

Be gentle with him, JD.


Pete
  #20  
Old March 19th 04, 06:11 PM
S o r n i
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Default "Actually you are the first person to bring up this issue"

Pete Jones wrote:
On Fri, 19 Mar 2004 11:58:47 -0500, Alex Rodriguez
blathered:

I have a front disc brake on my Van Dessel Super Fly. I've only had
to do really hard braking on one ocassion


http://vandesselsports.com/b_sfly.shtml

Be gentle with him, JD.


Hey, that rig is Super Fly!

Bill "street" S.


 




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