"Mark Hickey" <
[email protected]> wrote in message
news:[email protected]...
| "Nelson Binch" <
[email protected]> wrote:
|
| >"Carla A-G" <
[email protected]> wrote in message
news:[email protected]...
| >|
http://www.ne.jp/asahi/julesandjames/home/disk_and_quick_release/
| >
| >I wonder how widespread this article has become and if it will impact a lawsuit in the future.
| >
| >Kind of makes me glad I use rim brakes (even on my tandem!)
|
| I thought a lot of it was pretty good too, but do have a question (or three).
|
| The article claims that the skewer can deform enough to clear the "lawyer lips" on the fork. That
| seems pretty unlikely to me, at least with a properly-tightened QR. Slip, sure... I can believe
| that can happen. But the forces that would be required to stretch a steel QR shaft enough to get
| either end of the skewer over the lawyer lips would also break - or at least permanently stretch -
| the QR skewer shaft. Or more likely, strip the threads on the nutted end if the nut is aluminum
| (and most are).
|
| Besides, the top end of most lawyer lips are "squarish" which makes the whole prospect of forcing
| the wheel down over them even more difficult. Plus, I suspect you're going to have to actually
| force the QR down over both sets of lawyer lips simultaneously to get the wheel to fully disengage
| (read, fall off).
|
| If this were really likely, for every "total wheel disengagement", you'd see dozens of "near
| disengagements" which would result in one end of the QR skewer ending up perched on top the lip -
| and as far as I know, that simply doesn't happen.
|
| Make sense?
Very much so. I think if this were a real widespread problem, we would have heard about it a lot
more by now. Somebody with a modicum of engineering ability can make very believable arguments for
both sides of an issue like this (much like another issue!) so I come back to the first thing that
pops into my mind; if this was a real problem, somebody would be sued by now, period.
From a layman's perspective (I studied engineering in the 80s, but went into retail afterwards) I
don't see why there is a real different *at the hub* between rim and disk brakes since both are
applying torque in the opposite direction at about the same area of the hub (the bolt hole circle of
a disk compared to the spoke hole circle) with the main different that the disk applies more to one
side than the rim brake (if you really think about it, a rim brake is still a disk brake!)
Looking at the pictures in the article, it looks a lot more to me like *the skewer was not applied
properly* IMHO of course.
---
__o _`\(,_ Cycling is life, (_)/ (_) all the rest, just details. Nelson Binch =^o.o^=
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