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#21
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More on disk brakes and wheel ejection
In article ,
"John Rees" wrote: Well, I didn't see the rest of the discussion. Your post stands as the first in the thread on my newsreader. The post you responded to and quoted was undated, makes it tough for me to located the original thread.. I was the original poster and let me clarify a few things. First, the title of this thread is the title I used for my first post, but that was several weeks ago (and it was promptly ignored by most of the loud voices trying to shout down james Annan). The odds are it's spooled off your news server some time ago, but you can find the original post at Google. You can also find a lot of other posts on this very topic- search for James Annan as the author and you'll find them. |
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#23
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More on disk brakes and wheel ejection
Tim McNamara wrote in message ...
In article , (Spider) wrote: Why? AFAIK, there has been *no* experiemental research done on this system. If there are published articles, could you please post a link? I am very interested. I did. No, you didn't. The German firm gave STW some preliminary results, but I could not find a single, published article on this - and by that I mean an article that describes the materials and conditions under which the preliminary result was discovered. IOW, a scientific article, published in a peer-reviewed journal. The very first article in this thread was by me posted July 17th, prompted by seeing publication of experimental research that confirms there *is* a problem with current disk brake fork design. The doubting Thomases promptly ignored it. No, that article *did not* contain published work that describes the experiment. I apologize for not being clear on what I meant by "published article." The world of science attaches something wholly different to this term than the layman, and it behooves me to make that clear. Again, my apologies. Spider |
#24
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More on disk brakes and wheel ejection
In article
, Dave Lehnen wrote: That would require re-desining the calipers, n'es-ce pas? snip If the caliper is moved from the rear of the left fork to the front of the right fork, the hydraulic line or cable would still exit in about the correct (upwards) direction. You have to modify both the fork and the caliper mounts, so it requires redesigning the whole system. It makes non sense to revamp the caliper when the real problem is the hub-fork interface. -- Fact of life #15: Heads bleed, walls don't. |
#25
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More on disk brakes and wheel ejection
Maki wrote:
In article , Dave Lehnen wrote: That would require re-desining the calipers, n'es-ce pas? snip If the caliper is moved from the rear of the left fork to the front of the right fork, the hydraulic line or cable would still exit in about the correct (upwards) direction. You have to modify both the fork and the caliper mounts, so it requires redesigning the whole system. It makes non sense to revamp the caliper when the real problem is the hub-fork interface. For most calipers, you only need to modify the fork, as suggested above. An exception would be calipers like the Shimano XT, with different diameter leading and trailing pistons. Dave Lehnen |
#26
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More on disk brakes and wheel ejection
In article
, Dave Lehnen wrote: For most calipers, you only need to modify the fork, as suggested above. An exception would be calipers like the Shimano XT, with different diameter leading and trailing pistons. Oh, sorry. I missed the "from left to right part". Yes, in theory it will work, but I'm not sure all the calipers are made to brake backwards. The pads may very well be more supported in one way than the other. And you still need to replace the fork, usually the most expensive part. I don't understand what's wrong with improved skewers. -- Fact of life #15: Heads bleed, walls don't. |
#27
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More on disk brakes and wheel ejection
Why bother moving anything? Just replace the open end dropout with a
bolt on retainer, like on motorcycle F forks? Dio we really need thirty second wheel changes on a MOUNTAIN BIKE, for Christ's sake? May you have the wind at your back. And a really low gear for the hills! Chris Chris'Z Corner "The Website for the Common Bicyclist": http://www.geocities.com/czcorner |
#28
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More on disk brakes and wheel ejection
In article ,
Rick Onanian wrote: I saw skewers the other day that have a lock against unintentional loosening. They have a spring-loaded button you must press to release or turn/loosen them. Suppose these would help? IMHO yes. Experience shows that QRs that exceed by far the current iso standards exist, so it is clearly possible to make them strong enough. It remains the problem of sloppy users that dont' tighteen enough, so the QR can unscrew. With the lock this is gone too. However the ISO standard should be updated and require a specific logo on the skewer so that one can distinguish the good ones. -- Fact of life #15: Heads bleed, walls don't. |
#29
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More on disk brakes and wheel ejection
In article ,
Maki wrote: In article , Rick Onanian wrote: I saw skewers the other day that have a lock against unintentional loosening. They have a spring-loaded button you must press to release or turn/loosen them. Suppose these would help? IMHO yes. Experience shows that QRs that exceed by far the current iso standards exist, so it is clearly possible to make them strong enough. It remains the problem of sloppy users that dont' tighteen enough, so the QR can unscrew. Not so sure that this last sentence is really accurate. |
#30
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More on disk brakes and wheel ejection
In article ,
Maki wrote: Calipers are fine where they are, the weak link is the wheel/hub interface. No, the problem is that the fork design is flawed. Not the wheel/hub interface, not the QRs, etc. The fork puts the caliper in exactly the right place to push the wheel out of the dropout. Annan has demonstrated this quite clearly, yet people like yourself insist on shilly-shallying around looking for some kludge to try to overcome a significant design flaw. Why is this so difficult to comprehend? People's lives quite literally depend on this. The design should be corrected to prevent the wheel from being ejected from the dropout even if the skewer is left open, if it unscrews, if it breaks under tension, or whatever. The wheel should NEVER be forced out of the dropout as a result of braking! |
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