jim beam wrote in message ...
James Annan wrote:
jim beam wrote:

James Annan wrote:
snip

"The conclusion is that the braking action of disc brakes is not causing
the quick release mechanism to unscrew. This test is unable to cause
loosening. At this time there are no reasons to believe that anything
is missing or over constrained in this test."


james, did you check out the pics i posted of my own disk brakes?


Yes, but if you thought I'd be interested in a single case of "my wheel
didn't slip" then you have missed the point very very badly indeed.

polite as always. james, the point is not my "single case" but the lack
of cases that you present to the contrary. post some pics of forks
evidencing slippage if you please. dismissal of evidence that
contradicts your accusations does not add credibility to your case.

bottom line is this; put yourself in the position of a manufacturer.
are you going to pay attention to a guy on the net who, with respect,
misses a vital part of their analysis, then descends to personal attack
when challenged, or are you going to rely on your distributor network's
return data?

This from Mr. Sock Puppet! It's too rich! Did it ever occur to you
that few people pay attention to your counterexample not only because
it's somewhat beside the point, but that you've proven yourself
unreliable here on rbt? James may be "a guy on the net," but at least
he makes his name and his qualifications known. By your own reasoning,
we should give no credence to you.


trust me, i have been carefully on the lookout for potential ejection
problems among all the people i've ridden mountain with since you raised
this issue, and you may be interested to learn that i have actually seen
one case of slip! but problem is, there was no ejection and it was
clearly attributable to an open cam skewer, badly crudded up, that the
rider couldn't be bothered to close properly. so, like a broken chain
that's attributable to it not being fitted correctly or an under-clamped
brake cable slipping and causing brake failure, the only disk wheel
slippage i've seen was due to incorrect skewer deployment. and even
then, if i hadn't been specifically looking for the slippage, the rider
would never have known because he hadn't, nor had he /ever/ had, any
problems! certainly not anything as serious as ejection.

now, to address your cannondale point, it is clearly a carefully guarded
response, but i fail to see how you'd expect anything else in the face
of a serious liability threat that's not supported by any statistical
evidence.

It wasn't a carefully guided response. It was a confidential
communication between Cannondale and the CPSC and under the
circumstances both of them probably have a legal duty to be forthright
about the facts regardless of the legal consequences.

Furthermore, to the extent statistics has a bearing on this issue, it
also should clue you in to why your counterexample doesn't count for
much. Does the fact that I could take photographs of thousands of
upright SUVs mean that SUVs don't have a rollover problem?

mtb brakes changed from cantilever to linear p.d.q. once it
was established that incorrect usage combined with fouling could send a
rider over the bar. i don't know the numbers, but i'll wager there were
not many o.t.b's before manufacturers made the switch, however
statistically unlikely. unless disk brake ejection is actually
evidenced, then who is going to fix a problem that doesn't exist?


Now, have you any "reasons to believe that anything is missing or over
constrained in this test"?

Inquiring minds want to know...

James