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#21
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Carlton Reid on QR safety
Andy H wrote: Life sucks and **** happens, our (my anyway) pastime is rife with risk. If the design is inherently flawed why have we not all been maimed by our disk/qr problems? (As MV would no doubt wish :-). Who is "MV"? -- Tom Sherman - Fox River Valley "They [hominids] ARE acceptable prey, ESPECIALLY mountain bikers." - M.V. "We are discussing whether humans as prey are 'natural'. Clearly, they are, or that mountain lion wouldn't have been trying to eat a human." - M.V. "Abnormal would be a mountain lion speaking English." - M.V. "Mountain lions have always eaten humans, throughout our evolutionary history." - M.V. |
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#22
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Carlton Reid on QR safety
In article ,
"Andy H" wrote: "David Martin" wrote in message oups.com... Werehatrack wrote: Those of us who have seen your prior postings about the issue of disc brake ejections are fully aware of your position on the matter. Is it possible for you to accept the fact that for the majority of the readers, the evidence thus far published is not persuasive that there is a serious problem here which is not related to user error? Why do you claim to speak for the majority of readers, most of whom have expressed no public opinion on the matter? ..d Does the fact that the majority of people have expressed no public opinion (read; interest) speak volumes as to the severity of the problem? Do YOU know the relevant statistics to say that this is a major problem or design flaw? Life is inherently risky and I for one would rather check my qr's before a ride and have disk brakes than try to do what I do with rim brakes. I draw inferences from the fact that those who claim there is no problem refuse to comment upon the force diagram. -- Michael Press |
#23
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Carlton Reid on QR safety
Johnny Sunset wrote:
Andy H wrote: Life sucks and **** happens, our (my anyway) pastime is rife with risk. If the design is inherently flawed why have we not all been maimed by our disk/qr problems? (As MV would no doubt wish :-). Who is "MV"? He who must not be named. |
#24
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Carlton Reid on QR safety
While promoting this new mechanism as "safer" than the existing system, he
also insists that "industry experts say QRs are safe, when used correctly". This assertion is backed up with a quote from "industry expert" Bob Burns (actually Trek's *lawyer*), which is nothing more than a boilerplate denial dating to a few years ago when the QR/disk issue first surfaced. ======================= "In 2003, Bob Burns, Trek's US-based General Counsel, told BikeBiz.com: "Virtually all 'defective quick release' claims that I have seen relate to an improperly used quick release. Either the consumer has ridden with the QR open; ridden with the QR closed like a wing nut (rather than closing it over the cam); or ridden with insufficient tightness to the adjusting nut to engage the cam." ======================= Where, exactly, does the quote from Bob Burns say anything whatsoever about your QR/disk issue? He's addressing only one thing in the quote given- quick releases. Nothing about disk brakes. For that matter, not one place in the article is anything said about brakes. Just quick releases. And the timing and development w/regards Pacific Bicycles implementing a new quick release design probably has everything to do with the lawsuit they got hit with (quick releases supposedly failing in the field on low-end kids bikes) and nothing to do with disk brakes. --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com "James Annan" wrote in message ... Carlton Reid has a puff piece about a new "Secure QR system" on bikebiz: http://www.bikebiz.co.uk/daily-news/article.php?id=6427 While promoting this new mechanism as "safer" than the existing system, he also insists that "industry experts say QRs are safe, when used correctly". This assertion is backed up with a quote from "industry expert" Bob Burns (actually Trek's *lawyer*), which is nothing more than a boilerplate denial dating to a few years ago when the QR/disk issue first surfaced. Strangely, alongside this there is no space in his article for these quotes from people who actually have some relevant engineering and technical experience: --- Chris Juden, Technical officer, CTC: "It's not just scaremongering, but all hangs together and makes perfect sense. In fact I'm kicking myself for not thinking of it before." "changes must be made to the way disk brakes and front wheels are attached to forks" Jobst Brandt, author, "The Bicycle Wheel": "The more I see on this the more I find the defense of the status quo stranger than fiction. Why are writers trying to say that it can't happen? What motivates writers to claim that disc brakes as currently offered are not a hazard? The mechanism has been clearly stated, the forces have been identified in magnitude and direction, and credible descriptions of failures have been presented. What's going on here! There is no easter bunny. Believe it!" John Forester, author, "Effective Cycling": "All that I can say is gross negligence." Unnamed Marzocchi Tech Support: "It is recommended that an 8" rotor is not used on a standard axle fork because the forces exerted on the wheel can potentially pull the axle out of the dropouts." Brant Richards, On-One: "From the next batch, our rigid forks will have dropouts which are angled forward at 45degrees or thereabouts. This is because when I was coming home, and pulling a stoppy outside my driveway, I kept finding the front wheel shifted in the dropout." Dave Gray, Surly: "You are correct. I've noticed the problem on my Karate Monkey fork." Ben Cooper, Kinetics, describing his experiment: "Conclusion: From the above, there seems to be an effect from the disc brake which causes the quick release to loosen." --- And even more strangely, although he mentions the ongoing Walmart case concerning children's bikes, and refers repeatedly to user error, he also didn't find space to mention the recent out of court settlement in which a manufacturer paid off an (experienced adult) rider who was seriously injured by a front wheel ejection on a disk+QR fork. James -- James Annan see web pages for email http://www.ne.jp/asahi/julesandjames/home/ http://julesandjames.blogspot.com/ |
#25
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Carlton Reid on QR safety
in message , Richard
') wrote: Andy H wrote: Does the fact that the majority of people have expressed no public opinion (read; interest) Why do you read that? I have hitherto expressed no public opinion. I've read James' webpages on the subject and found his hypothesis interesting and convincing I've read James' web pages on the subject, and I've listened to other people (Darth Ben for example) who have empirically verified James' hypothesis. I ride a lefty off road. I did before I knew about this problem, it has to be admitted. But if I did now convert back to a conventional fork, it would have a through axle. -- (Simon Brooke) http://www.jasmine.org.uk/~simon/ ;; All in all you're just another hick in the mall -- Drink C'lloid |
#26
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Carlton Reid on QR safety
Shawn wrote:
Who is "MV"? He who must not be named. If you've never encountered worse on Usenet, you've led a sheltered life. -- Mike de Van Man |
#27
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Carlton Reid on QR safety
"Andy H" typed
Does the fact that the majority of people have expressed no public opinion (read; interest) speak volumes as to the severity of the problem? Do YOU know the relevant statistics to say that this is a major problem or design flaw? I have expressed nothing on the subject as I have no relevant knowledge. This does NOT mean I have no interest; I just try not to post if I have nothing useful to add. -- Helen D. Vecht: Edgware. |
#28
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Carlton Reid on QR safety
Richard typed
Andy H wrote: Does the fact that the majority of people have expressed no public opinion (read; interest) Why do you read that? I have hitherto expressed no public opinion. I've read James' webpages on the subject and found his hypothesis interesting and convincing; I would have liked to investigate the QR vibrational loosening in more detail, but as I neither sell, use, maintain, nor have any access to disk brakes or QR axles, I could add nothing useful to the debate. YAM & IAY... -- Helen D. Vecht: Edgware. |
#29
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Carlton Reid on QR safety
"Andy H" typed
"Richard" wrote in message ... Snip - ......but as I neither sell, use, maintain, nor have any access to disk brakes or QR axles, I could add nothing useful to the debate. R. Then do just that, you have no potential problems do you? Do you have the statistics to hand? Andy H The problem is not statistical. The problem is anecdotal. Many here in the UK will know of a single catastrophic event that might have been the result of wheel ejection. A single catastrophe does not a statistic make but it does not mean there is not a problem. That IS the problem. -- Helen D. Vecht: Edgware. |
#30
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Carlton Reid on QR safety
Mike de Van Man wrote:
Shawn wrote: Who is "MV"? He who must not be named. If you've never encountered worse on Usenet, you've led a sheltered life. Sure, but he's still a dick. |
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