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#11
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More on disk brakes and wheel ejection
I should put on lead armor before diving into this thread, but.... On Fri, 01 Aug 2003 17:20:24 GMT, wrote: How about a closed dropout with a new standard for attaching the front wheel? I see, you are trying to make friends with the many bicyclists who enjoy having easily changeable wheels. I don't think you are being any more realistic about this than your tightening theory. At about this point your admonition to "think about it" comes to mind. Why is the current QR system the _only_ one that could be easy? On my mountain bike, I have to flip the QR lever and then hand-unscrew the opposite side of the skewer partway. Why not close the dropout slots into holes, and make a skewer that's just a little quicker to unscrew all the way off and pull out of the wheel? Then, no tools required, and pretty much the same time to remove and replace the wheel. The only situation where it could be a problem is in a race. I imagine the only thing to change from the current system is the dropout, and minor change to skewers (which could still fit in existing wheels and be used in existing slotted dropouts). Disclaimer: I don't know what I'm talking about, and am a damn fool. There, I said it for you. G Jobst Brandt Palo Alto CA -- Rick Onanian |
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#12
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More on disk brakes and wheel ejection
Rick Onanian wrote:
Why is the current QR system the _only_ one that could be easy? On my mountain bike, I have to flip the QR lever and then hand-unscrew the opposite side of the skewer partway. Why not close the dropout slots into holes, and make a skewer that's just a little quicker to unscrew all the way off and pull out of the wheel? Then, no tools required, and pretty much the same time to remove and replace the wheel. The only situation where it could be a problem is in a race. I imagine the only thing to change from the current system is the dropout, and minor change to skewers (which could still fit in existing wheels and be used in existing slotted dropouts). Disclaimer: I don't know what I'm talking about, and am a damn fool. There, I said it for you. G I'm not sure what you are envisioning. You would then have to flex the fork legs outward to fit the axle, and most forks are too stiff to be flexed easily by that amount. This doesn't solve the problem anyway. There will be some play when the axle is fit into its hole. It would still get pushed up and down to the extent of that play by braking and bump forces. The play wouldn't result in wheel ejection, but it still isn't good design. Stergios |
#14
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More on disk brakes and wheel ejection
On Fri, 01 Aug 2003 15:35:38 -0400, Stergios Papadakis
wrote: I'm not sure what you are envisioning. You would then have to flex the fork legs outward to fit the axle, and most forks are too stiff to be flexed easily by that amount. No, you'd just pull the skewer right out of the wheel. This doesn't solve the problem anyway. There will be some play when the axle is fit into its hole. It would still get pushed up and down to the extent of that play by braking and bump forces. The play wouldn't result in wheel ejection, but it still isn't good design. Well, I'm no engineer, but an engineer could probably come up with something like my idea but better. Or, just make the dropout holes the same size as the hole in the hub -- the hub doesn't have any play up and down on the skewer. Stergios -- Rick Onanian |
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More on disk brakes and wheel ejection
Sheldon Brown wrote:
Quoth Jobst: We don't need no steenkin further research, as they say. All that is needed is to move the caliper ahead of the fork, nothing more. In my estimation, this is the only reasonable solution that would conclusively solve the problem. 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. Dave Lehnen |
#16
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More on disk brakes and wheel ejection
Rick Onanian wrote:
No, you'd just pull the skewer right out of the wheel. You should go look at your bike. The front wheel's axle fits into the dropouts. It is not just the skewer in the dropouts. Go ahead and pull your skewer out with someone sitting on the bike. The skewer is a skinny piece of metal because it is only supposed to be loaded in tension. The outside of the axle presses against the top of the dropout slot when the skewer is removed. The skewer has enough play that it slides through the hole in the axle. That is enough. What you are proposing is dangerous. You are proposing eliminating the part of the axle that extends into the dropout. That would not only make it difficult to line up the axle with the little holes and get the skewer through, but it would load the skewer in shear if you ever adjusted it with any load on the bike. Stergios |
#17
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More on disk brakes and wheel ejection
On Fri, 01 Aug 2003 17:25:53 -0400, Stergios Papadakis
wrote: No, you'd just pull the skewer right out of the wheel. You should go look at your bike. The front wheel's axle fits into the dropouts. It is not just the skewer in the dropouts. Go ahead and pull your skewer out with someone I knew there was a reason why it wouldn't work...but I figured I'd suggest it anyway. As soon as I read this far, I remembered just how it goes together, and why it wouldn't work. What you are proposing is dangerous. Agreed. I guess a new system would, in fact, have to be made which wouldn't be compatible with old skewers and hubs, but I suspect it could be made compatible with old dropouts...not that anybody would have any reason to use a new, structural-skewer wheel with old, slotted dropouts. All of that said, I bet a proper engineer, or even myself on a more creative day, could come up with a workable system that's more compatible. And, even so, it wouldn't be worth it; it has been said over and over in this thread that moving the caliper a little bit, or changing the angle/direction of the dropout, would eliminate the whole issue. Sounds like a lot easier than redesigning the QR wheel attachment system. Stergios -- Rick Onanian |
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#19
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More on disk brakes and wheel ejection
On 1 Aug 2003 15:07:55 -0700, Spider wrote:
I own disk brakes, and use them often, on a mountain bike. Often? Do you sometimes ride that bike without using them? Spider -- Rick Onanian |
#20
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More on disk brakes and wheel ejection
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