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#11
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Disc brake front wheel ejection: fact or fantasy?
Alex Bird wrote:
This is my first post to this group, sorry it's a bit grim. I saw a tv programme 3-4 years ago here in the uk, about a kid in the west-country (SW England). His front wheel came loose and _somehow_ the forks ended up in the back of his skull. They showed the x-rays, a few more millimetres and he would have been dead. Yes, he was fine, after some medical attention. I think I've checked my quick release every time I've got on my bike since I saw that... Not quite the same thing. He popped a wheelie off a kerb, the wheel fell out, chucked him over the bars and the bike then somersaulted in to his head. Bet he couldn't do that again if he tried Why would discs be more likely to release the wheel? This makes no sense to me. How technical do you want to get? http://www.kinetics.org.uk/html/disc_brakes___qrs.html |
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#12
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Disc brake front wheel ejection: fact or fantasy?
Alex Bird wrote:
This is my first post to this group, sorry it's a bit grim. I saw a tv programme 3-4 years ago here in the uk, about a kid in the west-country (SW England). His front wheel came loose and _somehow_ the forks ended up in the back of his skull. They showed the x-rays, a few more millimetres and he would have been dead. Yes, he was fine, after some medical attention. I think I've checked my quick release every time I've got on my bike since I saw that... Not quite the same thing. He popped a wheelie off a kerb, the wheel fell out, chucked him over the bars and the bike then somersaulted in to his head. Bet he couldn't do that again if he tried That was from 999, and was way longer than 3 or 4 years ago. Why would discs be more likely to release the wheel? This makes no sense to me. How technical do you want to get? http://www.ne.jp/asahi/julesandjames...quick_release/ |
#13
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Disc brake front wheel ejection: fact or fantasy?
Most likely more than half of the people out there that ride 'mountain
bikes' have never heard of this issue and wouldn't know where to find a 'quick release skewer' on their bikes if they had to. Many of the pure recreational riders and Dewbies that I know just aren't interested in regular equipment checks. They'll check it if it happens, otherwise ignorance is bliss and they'll ride it 'til it breaks. With so many amateur riders out there it's amazing that front wheels aren't falling off left, right and centre. And not from braking forces - just from lack of proper adjustment. You really think so? I get a bit paranoid about my QR skewers and check them before every ride. I also check my headset before every ride, though that didn't stop it getting loose on my last run. I think it may be the way I ride - everything seems to come loose on my bike. I've had the saddle come loose once too. Last thing I want to be doing is eating my steering tube for breakfast... -- ....meandering mule... |
#14
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Disc brake front wheel ejection: fact or fantasy?
bomba wrote in message ...
Doug Taylor wrote: So, my question is: has anybody who actually rides mountain bike with any frequency (such as the amb crowd) experienced this phenomenon or heard of anybody loosing a wheel? If so, any serious injuries? Is the sky really falling or can we get back on our bikes and ride? Do you remember a guy posting here called Russ Pinder? Well, he's currently in a wheelchair. I believe that an analysis of the accident says the cause for the wheel ejection was not knon, and might never be known. Without knowing the initial conditions, nor having any analysis done on the fork post-crash, I don't think anyone will ever know exactly how it happened. Spider |
#15
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Disc brake front wheel ejection: fact or fantasy?
On Tue, 2 Sep 2003 11:09:56 +1200, Westie penned:
Any piece of equipment needs adjustment from time to time to keep it both safe and well tuned. But there are riders out there that just ride until something major falls off - and if it's the QR coming loose because it hasn't been checked - ever, then you've got a problem. I'm not saying that they're careless or incompetant, it's just never something that occurs to them. They consider the worst thing that can happen to them is a puncture or maybe 'changing gear' problems. Maintenance is a bit of oil on the chain. It's never occurred to them that a wheel might fall off. -- Westie I specifically asked a LBS about bike maintenance classes, and the salesguy claimed that he knew of no such thing in the area. As my fiance seems to have a handle on the maintenance thing, I haven't gone looking too hard, but, jeez! The LBS guy acted like it should all be common sense ... and maybe it should ... but I've never assembled or maintained anything mechanical, aside from putting parts into a computer, where all moving parts are carefully hidden from the user. I know enough to know that I don't know what I'm doing when it comes to bikes (cars, lawn mowers, garbage disposals, spigots ...). At least mounting the bike on the car every trip means I have to make sure my front tire is properly positioned before riding off ... and after having an issue with my brakes at the beginning of one trip (something about the end of the wire near the handlebars coming out of position), I do test both front and rear brakes before going anywhere. -- monique |
#16
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Disc brake front wheel ejection: fact or fantasy?
I have had the QR open on my Cannondale F900 with disc brakes. The
lawyer tabs kept the wheel from coming all the way out and it was an interesting ride feel until I got stopped. I was bombing some very washboard single track at the time. It has only happened the one time. I am pretty diligent about making sure that when put the front wheel on that I have it tight, so I do not think that this was the problem. Who knows. This has never happened on any of my other bikes, present or past that have "regular" brakes. Mike "Doug Taylor" wrote in message ... The boys (the girls are too sensible, it seems) in rec.bicycles.tech are going at it once again on this subject, with the tech heads and roadies basically saying that you are taking your life in your hands if you use disc brakes with QR's and regular dropouts on the theory that the QR eventually will come loose under force of the front brake and your wheel will pop off. So, my question is: has anybody who actually rides mountain bike with any frequency (such as the amb crowd) experienced this phenomenon or heard of anybody loosing a wheel? If so, any serious injuries? Is the sky really falling or can we get back on our bikes and ride? --dt |
#17
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Disc brake front wheel ejection: fact or fantasy?
RE/
I switched to non-quick release skewers about a month ago. I always considered quick release to be a solution to a problem I never had. It's no big deal to carry an allen wrench and it makes it tougher for a thief to steal your wheels. Don't have QR on my seat collar either. Where did you get them? I'd like to get a set just because the levers on mine are so hard to open up when the wheel needs removing... ----------------------- PeteCresswell |
#18
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Disc brake front wheel ejection: fact or fantasy?
RE/
Why would discs be more likely to release the wheel? Something about the direction of forces infolved when the calipers grab the disk. I can't put it into words, but after reading the discussions here I can visualize it easily. One clue: if the calipers were in front of the hub instead of behind, there wouldn't be a problem. ----------------------- PeteCresswell |
#19
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Disc brake front wheel ejection: fact or fantasy?
RE/
With so many amateur riders out there it's amazing that front wheels aren't falling off left, right and centre. And not from braking forces - just from lack of proper adjustment. I don't check mine either - but I think there's a fallacy in the "..we haven't heard anything about it, so it must not be happening...." line of thinking. Nobody's doing post-crash analysis' of bike accidents like the FAA does in airplane crashes and people who get greviously injured probably don't broadcast it to the world. More likely, they just sort of fade away from the biking world... Bottom line for me is that nobody really knows - qualified by the observation that there hasn't yet been a legal feeding frenzy involving fork makers, which has to count for something considering the litigiousness (sp?) of the current release of USA. ----------------------- PeteCresswell |
#20
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Disc brake front wheel ejection: fact or fantasy?
(Pete Cresswell) said...
Where did you get them? I'd like to get a set just because the levers on mine are so hard to open up when the wheel needs removing... ----------------------- PeteCresswell Nashbar. There is a category for skewers. They're nothing fancy, but they get the job done. I don't miss QR at all. |
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