jim beam wrote:
> James Annan wrote:
> > jim beam wrote:
> >
> >>James Annan wrote:
> >
> >
> >>>http://www.ne.jp/asahi/julesandjames/home/disk_and_quick_release/QRReport1.pdf
> >>>
> >>>
> >>>The Howat numbers are an order of magnitude lower than your risible
> >>>"calculation" of the retention ability of a QR that you made up
> >>>previously. They are similar to (often lower than) the estimated
> >>>ejection force.
> >>
> >>they're lower if the qr is not tightened sufficiently [go figure -
> >>obviously it would take a climatologist to work that one out] and
> >>substantially higher when tightened correctly.
> >
> >
> > Please define "tightened correctly",
>
> i refer you to your favorite paper, howat. or failing that, read
> manufacturer instructions some time.
>
> > and describe how a rider can
> > achieve this with no tools.
>
> read the shimano instructions. you /do/ read instructions don't you annan?
Yes, I do, which is why I asked you what you meant. And of course you
ducked the question, because you are making this up as you go along,
ducking and weaving as you go.
In fact, it is clear that the manufacturers' instructions do not
guarantee that the QR will withstand a disk brake force. For starters,
they do not instruct the user to chip all the paint off his fork
dropouts.
> > You may find it helpful to refer to
> > instructions provided by any QR manufacturer, or bike manufacturer, or
> > retailer. Note that your method to ensure that the skewer is "tightened
> > correctly" should guard against overtightening, as well as
> > undertightening.
>
> hmm, so when, in print, a manufacturer instructs a user to tighten "with
> as much strength as possible", do you find that equivocal in any way?
I find it worrying that any manufacturer would think it appropriate to
give such instructions.
> do you seriously think you can break a qr by hand???
That comment is particularly good timing, coming as it does just a few
days after someone in a different thread mentions a case of just this
happening. Are you actually claiming that it is not possible to
overtighten a QR?
First google hit:
-----
OVERTIGHTENING THE QUICK RELEASE MECHANISM MAY DAMAGE THE QUICK RELEASE
ASSEMBLY. FOR FURTHER INFORMATION ON CORRECT ADJUSTMENT OF THE QUICK
RELEASE TENSION, SEE ADDITIONAL INFORMATION BELOW:
To properly close the quick release mechanism requires between 15
and 45 pounds of force. [55 to 200 Newton]. If the required closing
force is greater than 45 pounds, open the lever and loosen the
mechanism adjusting nut. Close the lever again.
-----
I know that Salsa give an explicit range of 24-30 pounds of force on
the QR lever.
So, how about that "correctly tightened" thing. Care to try again?
James