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#21
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Threaded versus threadless headset
On Wed, 20 Aug 2003 17:25:49 -0400, Rick Onanian wrote:
On Wed, 20 Aug 2003 16:28:41 -0400, David L. Johnson wrote: Yes, it's simple enough to re-adjust, though I do not like the idea of trying to adjust the preload if the bearings are not clean and well- lubed. Okay, now I'm a bit afraid again. I've never heard of the term "preload" applied to anything other than suspension. What is "preload" in this context, and how should I check / adjust it? Like I said, I've changed stems a couple times on my threadless road bike, and haven't noticed any looseness or maladjustment from it...and have had my longest and fastest ride ever just a few days ago. Preload, I think, is just the "load" put on the bearings when you tighten the bolt in the cap. If you want to know for sure what's going on, take apart your bike. It's easy to do and will show you how everything works. I built my mountain bike from the ground up (ordered the frame, the parts, the wheels, etc.). It's not hard to do. -- Bob M in CT Remove 'x.' to reply |
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#22
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Threaded versus threadless headset
On Wed, 20 Aug 2003 21:32:17 GMT, Bob M wrote:
Preload, I think, is just the "load" put on the bearings when you tighten Good. I tightened it nicely every time. the bolt in the cap. If you want to know for sure what's going on, take apart your bike. It's easy to do and will show you how everything works. I have quite the collection of beaters I can experiment on, lately. I should do that. Heck, I even have a birthday coming up; maybe I'll ask for a tool kit. I built my mountain bike from the ground up (ordered the frame, the parts, the wheels, etc.). It's not hard to do. I'd like to do that sometime...I just lack the money. -- Rick Onanian |
#23
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Threaded versus threadless headset
"Hjalmar Duklęt" wrote:
What's the advantage of a threadless headset over an oldfashioned threaded one? Is the threaded one stiffer/lighter? Threadless systems are significantly stiffer, sometimes lighter, and less likely to suffer structural failure than quill stem systems, for any given materials and tolerances. This is primarily due to the categorical superiority of an external binder clamp vs. an internal expander wedge, but also due to the weakening effect of steerer threads. The other advantage of threadless headset systems is that the steerer tube wall thickness is not dictated by the assembly, allowing the use of materials besides steel (or the use of different thicknesses of steel). There is a cost benefit of threadless forks to manufacturers and distributors, because all sizes of frames may be accommodated with a single type of fork. Note however that the cheapest mass-market bikes, which were only ever offered in one size, have retained quill stems and threaded headsets. Would it improve my riding in any way going from threaded to threadless? Not noticeably. If your bike is already set up, there is no compelling reason to swap systems unless you must replace your fork. Chalo Colina |
#24
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Threaded versus threadless headset
To the guy that claimed he ripped a quill stem out of a head tube. This
just seems hihgly unlikely and probably you never had the stem bolt tightened in there to begin with. They've raced 100 years of the Tour de France on quill stems with the strongest sprinters of the time and never once has a quill stem come close to being pulled out of a head tube. -- -------------------------- Posted via cyclingforums.com http://www.cyclingforums.com |
#25
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Threaded versus threadless headset
"Fabrizio Mazzoleni" wrote in message .ca...
David L. Johnson wrote in message ... With a quill stem (that is, with a threaded fork and headset), And if you do see guys with quill stems on the next ride then find another group to ride with, because they are the 'B' group. Those are probably the same lamers that are running conventional 32 spoke wheels. Not the types you want to been seen with! Not at all; my wheels are either 36H, or 40H, 3X and tied and soldered ;-) It all fits perfectly well with my quill stem, Brooks saddle, and sandals as my footware :-) - rick |
#26
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Threaded versus threadless headset
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#27
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Threaded versus threadless headset
If you ever pack your bike in a box or a bike suitcase for travel,
usually you have to turn the handlebars sideways. With a quill stem you loosen the expander wedge, drop the stem and twist; then reverse the process to unpack. With threadless you loosen the stem clamp and twist the stem on the steerer but you have to readjust the pre-load when you unpack; a minor difference. EXCEPT with my Klein's internal headset the bearings are bonded to the inside of the head tube and the fork is bonded to the bearing cartridges so there is no pre-load adjustment; in fact the spacers are just cosmetic and there is no top cap at all - just a rubber plug. They changed this in 2002 to go with the star-fangled nut design. -- Check out my bike blog! http://diabloscott.blogspot.com -------------------------- Posted via cyclingforums.com http://www.cyclingforums.com |
#28
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Threaded versus threadless headset
On Wed, 20 Aug 2003 16:52:23 -0400, Rick Onanian
may have said: On Wed, 20 Aug 2003 18:31:12 GMT, Werehatrack wrote: As one who has yanked the quill entirely out of the tube, I can tell you that this is a dangerous assumption to make. Riders can and will *pull* on the bars when pedalling hard. Sometimes hard *vertically*. This remains true whether it's advisable and safe or not. This would seem to mitigate in favor of the threadless design; the attachment method is probably stronger, but as you note, the reality is that Stronger or not, the threadless may give more warning. You may notice that it's working it's way off the steerer earlier than you would notice a threadless working it's way out of the head. I don't know. I've never had either one happen. I'd think a threadless would have to get detectably sloppy before it would work its way up much, but I've had a threaded quill (of admittedly low-end design) that was able to work up in the tube past the min insert line with time, even though it still seemed to be tight. The Ritchey in one of my other bikes gets more strain and never budges so much as a millimeter, though, so it's obviously possible to make a threaded quill that will resist my abuse. That said, threaded still seems to make more sense to me. Maybe I'm just a reactionary, but I just can't see that there's any important advantage *for me* in the threadless setups. That might change someday, but it will probably be a while. -- My email address is antispammed; pull WEEDS if replying via e-mail. Yes, I have a killfile. If I don't respond to something, it's also possible that I'm busy. |
#29
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Threaded versus threadless headset
"Hjalmar Duklęt" wrote in message ... Hi, What's the advantage of a threadless headset over an oldfashioned threaded one? Is the threaded one stiffer/lighter? Would it improve my riding in any way going from threaded to threadless? Hjalmar Many thanks to all who have made their comments on my issue. My conclusion is that I really don't need to swap fork/stem on my Trek 5500. I don't have problems riding with other riders because of this obsolete setup, I like to be able to change the hight of the bar without to much fuss, I also regularly check that the stem is not stuck in the steerer (after having to use a hacksaw to get the stem out of another bike/fork) and it probably will not improve my sprint due to its better rigidness. Finally, I'll save a lot of money. Hjalmar |
#30
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Threaded versus threadless headset
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