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#21
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Carbon post stuck in aluminum frame.
On Sun, 07 Aug 2005 09:11:54 +0200, Derk
wrote: Hi Carl, wrote: This sounds like the stuff works like grit rather than glue, though there's probably a better word than "grit". Yes, the small particles that are added are sais to bind to the carbon and thus the friction between the two materials is enhanced. I heard from someone who used it, that it sounds like there's sand between the two parts when you tighten the bolts. Presumably, hard pieces stick between tiny irregularities of the post and tube to resist turning or moving up and down, like two pieces of sandpaper. Yes,I think so. The Babel translator has a 150-word limit, but here's the address again for anyone interested: I think they use the same translators that are used to make user manuals that come with electronic equipment that is produced in Far Eastern countries ;-) Greetings from extremely wet Holland, Derk ^^^^^^^^^^^^^ Dear Derk, So far this year, 6.98 inches of rain--beastly damp. Cheers from Pueblo, Colorado, Carl Fogel |
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#22
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Carbon post stuck in aluminum frame.
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#24
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Carbon post stuck in aluminum frame.
wrote: Wayne Pein writes: What is the mechanism for this and is there are way to get it out and prevent future freeze ups? I haven't heard of this before but it is probably the same as in any kind of steertube. From the way you write this and that it is "stuck" makes me visualize a quill stem. The quill stem is dead! Dead! Dead! Brain dead? Send me a pic of a carbon quill stem.... http://www.sheldonbrown.com/brandt/stuck-stem.html http://www.sheldonbrown.com/brandt/t...s-headset.html Use quill stems on antique bicycles and only for display purposes. Jobst BrandtB |
#25
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Carbon post stuck in aluminum frame.
Qui si parla Campagnolo wrote:
wrote: Wayne Pein writes: What is the mechanism for this and is there are way to get it out and prevent future freeze ups? I haven't heard of this before but it is probably the same as in any kind of steertube. From the way you write this and that it is "stuck" makes me visualize a quill stem. The quill stem is dead! Dead! Dead! Gee, good non-answer Jobst. Yes, seatposts do get bonded into seat tubes. The ONLY place we use no grease is for a carbon SP and carbon frame. Otherwise, some sort of grasso. Corrosion bonds this stuff together. To get the old one out, cut it off, use a hacksaw blade and try to cut notches in the remnanats to take it out piece by piece OR have somebody with a large drill drill the remnants out carefully. http://www.sheldonbrown.com/brandt/stuck-stem.html http://www.sheldonbrown.com/brandt/t...s-headset.html Use quill stems on antique bicycles and only for display purposes. yer so FOS on this one. Quill, like Deltas, work just fine, I'll send ya a pic of my modern merckx with a threaded fork. Jobst Brandt Try warming it up with a hair dryer, aluminium has a pretty high expansion rate. Zoom |
#26
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Carbon post stuck in aluminum frame.
"Qui si parla Campagnolo" wrote in message ups.com... The ONLY place we use no grease is for a carbon SP and carbon I've been applying light grease to my carbon SP for my carbon seat tube. It seems to slide in and out easier when I want it to and I don't have any problems with it moving when it is clamped in place. Do you see an advantage to "dry" installation in this situation? BobT |
#27
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Carbon post stuck in aluminum frame.
Thanks All for the thoughts. I'll pass them on to my Bud.
Wayne |
#28
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Carbon post stuck in aluminum frame.
Qui si parla Campagnolo wrote:
Send me a pic of a carbon quill stem.... WR Compositi made a stem with a carbon fiber quill. It's not on their current site, but a photo is he http://www.giroposte.com/Bars_Stem.html |
#29
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Carbon post stuck in aluminum frame.
Derk wrote: There is a newly developed carbon paste (for mounting carbon seatposts in carbon frames). Acco rding to TOUR, it reduces the needed torque by at least 30%. It's calles Danamic acrbon Paste. When I greased my aluminum seatpost in steel frame I found I had to use unsatisfactorily high clamping force. Perhaps due to a slight mismatch but I couldn't tell. I switched to Proofide or similar wax-based leather treatment and had no further problems. Perhaps this carbon paste would be useful for regular seatposts too, although I'm sure it costs a mint. Proofide, Sno-Seal, maybe beeswax, work fine. |
#30
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Carbon post stuck in aluminum frame.
wrote: The quill stem is dead! Dead! Dead! http://www.sheldonbrown.com/brandt/stuck-stem.html http://www.sheldonbrown.com/brandt/t...s-headset.html For someone of your size and riding habits I'm sure threadless has been a great leap forward. I've read your arguments and found them convincing. However none of them apply to me. I've never had the slightest corrosion problem, no matter the weather. Perhaps because I'm not large enough to pump the stem back and forth, with 40cm bars. Or perhaps because I have enough grease at the opening to the elements. But if I were to have such problems, I'm sure they would be nothing that couldn't be fixed with a suitable rubber cover/ring at the opening. Ease of adjustment: I adjust the headset and tighten the locknut or is it locknot with my fingers. I've never had the slightest problem this way. It stays in adjustment a long long time. When I was younger and doing things by the book, I once used the big wrench to really tighten the locknut. I couldn't tell any difference. Clamping of the bars: the open clamp is certainly more convenient but it has nothing to do with the headset. There are threadless stems with closed clamps and quill stems with open clamps. Nearly all of the threadless stems I see on new bikes in the shop (e.g. Bontrager on Trek) have only two clamping bolts and I don't think this is wise. I like the increased safety of the closed clamp. I like the smooth lines of the regular stem. I recall the days when the allen bolt was touted as a safety feature over the regular slightly protruding hex nut (if you fly over the bars, you'll slide cleanly!), and I don't like those protruding fasteners at the back. I see they are supposed to be clamped tight and I don't like the idea of such rigid torsional clamping in a crash. Finally, I like the ability to adjust the height. I also change the height of my saddle with QR clamp and it's nice to be able to move things around, if only for the sake of variety. Some people need one and some people need the other but both work. Personal preference is a pretty good criterion in this case. |
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