Bike Snob NY (Eben Weiss) on carbon
#151
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LOL it's 2024 and we all are still on an Internet forum. What did you expect? 😂
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#156
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I would never clamp any bike by the top tube, whether in a work stand or a bike rack. I think that's going to be true of most riders who are serious enough to consider purchasing cf bikes.
By the way, that Thule adapter that allows one to clamp a cf bike by the frame tube costs a whole $30. You provided the link -- did you notice just how inexpensive the solution is? Less than a decent saddlebag.
In other words, you've made up an imaginary problem.
By the way, that Thule adapter that allows one to clamp a cf bike by the frame tube costs a whole $30. You provided the link -- did you notice just how inexpensive the solution is? Less than a decent saddlebag.
In other words, you've made up an imaginary problem.
I will say my newest steel bike had a similar warning from the builder, so this certainly applies to all high end light tubed bikes, no matter what the material
I would disagree on the first point in that there are a significant percentage of people who buy high end CF bikes who never wrench, read the manual or understand the material. I have seen more than a few nice CF bikes hanging by the top tube on car racks
and none of this deals with simple thing like bikes falling and hitting top tube with handle bars
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)
Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)
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Again, this is not a carbon fiber problem.
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Apparently you have missed the many bf threads about damaged steel and aluminum bike frames. Some of them have been quite amusing. There was the poster who had clearly dropped his aluminum frame's top tube into a door frame and put in a vertical crease… But he insisted it came from changing temperatures creating some kind of vacuum effect inside the frame. There was also a guy who took out his brand new, custom built, thin walled tubing steel frame on its very first ride, and let the handlebar twist around and slam into the top tube. Boy, was he angry! The builder, Waterford, would not give him a free repair. Richard Schwinn’s response was, “You wanted a lightweight steel road bike – you got it!“
Again, this is not a carbon fiber problem.
Again, this is not a carbon fiber problem.
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But if you think aluminum or steel gives warning before failing, it often does not. The first indication of a problem is the usually rider on the ground.
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Despite their high initial strength-to-weight ratios, a design limitation of CFRPs are their lack of a definable fatigue limit. This means, theoretically, that stress cycle failure cannot be ruled out. While steel and many other structural metals and alloys do have estimable fatigue or endurance limits, the complex failure modes of composites mean that the fatigue failure properties of CFRPs are difficult to predict and design against. As a result, when using CFRPs for critical cyclic-loading applications, engineers may need to design in considerable strength safety margins to provide suitable component reliability over its service life.
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dogmatic /dôg-măt′ĭk, dŏg-/
adjective
- Relating to, characteristic of, or resulting from dogma.
- Asserting or insisting upon ideas or principles, especially when unproven or unexamined, in an imperious or arrogant manner.
- Characterized by such assertion, often with an unconsidered rejection of criticism.
"a dogmatic adherence to a single educational model."
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FAA Report 2011
The other truth about composite structures is that they are complex, and manufacturing defects can occur that may alter their fatigue life. That's why well-designed composites include a margin of safety. Even with this margin of safety, CF's still stronger, lighter, and much longer lasting than an equivalent metal structure.
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...keep the faith, Terry. When you start accusing Wikipedia of using " CF scare words ", the discussion has transcended the rational, and entered the realm of dogma.
...keep the faith, Terry. When you start accusing Wikipedia of using " CF scare words ", the discussion has transcended the rational, and entered the realm of dogma.
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If we take a comparison. The F/A-18c has carbon fiber wings. The airframe is rated for 6000 hours of flight consisting of strains far higher any bike frame should ever experience. If you ride a bike for 6000 hours you can calculate how many miles that bike will accumulate. It's a few.
So whilst CF fatigue can't be ruled out, it clearly isn't an issue in bike applications.
If we're discussing ultra light frames, well then steel certainly doesn't have an advantage since with thin tubes with thin wall thicknesses the riding strains are well above the fatigue limit. That's partly why ultralight steel frames don't tend to last. With carbon, perhaps that's true as well but a carbon frame of the weight of an ultralight steel frame is still just a basic carbon frame.
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Originally Posted by original article
And no, I’m not one of those retrogrouches who’s afraid of carbon bikes and thinks they’re all about to explode at any moment. In fact, I rode a 35 year-old carbon bike through the Swiss Alps. (It was a finely aged hunk of cheese.) Yes, I know they make airplanes out of it. Yes, I know it can often be repaired. Yes, I know the majority of people who own carbon fiber bikes won’t have a problem with them. But airplanes have a whole federal agency looking after them, and who the hell wants to have to send their bicycle frame out for repair because of some dumb little crash in the first place?
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thanks
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dogmatic /dôg-măt′ĭk, dŏg-/
adjective
- Relating to, characteristic of, or resulting from dogma.
- Asserting or insisting upon ideas or principles, especially when unproven or unexamined, in an imperious or arrogant manner.
- Characterized by such assertion, often with an unconsidered rejection of criticism.
"a dogmatic adherence to a single educational model."
When I rustle plastic in the kitchen my dog automatically appears.
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Road 🚴🏾♂️ & Mountain 🚵🏾♂️
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Then look for "edit ignore list" over on the left in settings and options. Should open right up.
You're welcome. It's for the best. Good luck in all your future endeavors, etc. etc. etc.
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It's rather amusing how some folks believe tweaking someone's name is the pinnacle of cleverness. It's like they've stumbled upon the secret recipe for wit in the kindergarten playbook. If you think altering a word magically transforms you into a linguistic wizard, perhaps it's time to graduate from the school of juvenile jests and embrace the vast world of mature banter. After all, playing with someone's name is about as sophisticated as building a sandcastle in the intellectual desert.
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Hey ... PrettyPonyPerson ...
ATTENTION.
There is some of the attention you crave. Hope it helps.
ATTENTION.
There is some of the attention you crave. Hope it helps.
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#175
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It's rather amusing how some folks believe tweaking someone's name is the pinnacle of cleverness. It's like they've stumbled upon the secret recipe for wit in the kindergarten playbook. If you think altering a word magically transforms you into a linguistic wizard, perhaps it's time to graduate from the school of juvenile jests and embrace the vast world of mature banter. After all, playing with someone's name is about as sophisticated as building a sandcastle in the intellectual desert.
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