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Threadless steer tube extender
My road bike has a 1 1/8 threadless carbon fork w/ integrated headset,
metal steer tube. I have a 90mm 7 degree stem and the reach seems about right. (I've tried 80 and 100). I'd like to get a little more height for the handle bars - I'm only looking for 1/2 - 1 inch (~2 cm). I've tried stem flipped up and down - there is a tiny difference, but not major. My options are to get a higher angled stem or a steer tube extender. Oh, I guess I could buy a new fork, but I'm not going to. There are also two extenders that appear to be available. I'm familiar with the ones that clamp onto the steer tube and extend upward: http://tinyurl.com/27pr46 I recently found a completely different style: http://tinyurl.com/2gbeaz. Basically, instead of clamping around the exterior of the head tube as the other kind does, this one has an internal expansion plug (I guess it's similar to a quill stem?). The accompanying text says: Size: 28.6/25.4 Adapter that enables you to make your steering tube longer Does not effect the function of the Ahead system Compatible with threaded and threadless headsets Comes with a lightweight alloy BBB Roundhead head cap Has anyone used one of these? Will it work for what I need? I'm thinking I'd have to remove the star nut and place this inside the steer tube. The expansion wedge at the bottom would connect it solidly to the steer tube. I'd then have to set the bearings by pulling up on it, or maybe the star nut would then go inside the extension tube? Anyway, for $12, I might just buy one and try it, but I was wondering if anyone was familiar with this thing. Thanks in advance. |
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#2
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Threadless steer tube extender
Camilo writes;
There are also two extenders that appear to be available. I'm familiar with the ones that clamp onto the steer tube and extend upward: http://tinyurl.com/27pr46 The above is the one you want. I recently found a completely different style: http://tinyurl.com/2gbeaz. Basically, instead of clamping around the exterior of the head tube as the other kind does, this one has an internal expansion plug (I guess it's similar to a quill stem?). As mentioned, the above item extends the steering tube. Example if you wanted to adapt forks from a smaller frame to a larger frame this item would be the "alternative" to buying new forks with a proper length steering tube. You may be able to use this extension with several mm's of spacers but I wouldn't. If you think about it just a bit more Camilo I think you'll choose the former versus the later. Best Regards - Mike Baldwin |
#3
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Threadless steer tube extender
Typo Alert - later should be ladder...
Best Regards - Mike _LATTER_ Baldwin |
#4
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Threadless steer tube extender
The problem with the extender is that the minimum amount of extra height you
get is the height of the part that's large enough to fit over the existing steerer, and that's going to be a bit more than twice the additional 2cm you speak of... An 8cm plus/minus 17 degree stem when flipped up will give you just over 2cm extra height and the same reach as about a 7.5cm 90 degree stem. Extender #2 (internal wedge) would only be for steel steerers. Nick "Camilo" wrote in message ... My road bike has a 1 1/8 threadless carbon fork w/ integrated headset, metal steer tube. I have a 90mm 7 degree stem and the reach seems about right. (I've tried 80 and 100). I'd like to get a little more height for the handle bars - I'm only looking for 1/2 - 1 inch (~2 cm). I've tried stem flipped up and down - there is a tiny difference, but not major. My options are to get a higher angled stem or a steer tube extender. Oh, I guess I could buy a new fork, but I'm not going to. There are also two extenders that appear to be available. I'm familiar with the ones that clamp onto the steer tube and extend upward: http://tinyurl.com/27pr46 I recently found a completely different style: http://tinyurl.com/2gbeaz. Basically, instead of clamping around the exterior of the head tube as the other kind does, this one has an internal expansion plug (I guess it's similar to a quill stem?). The accompanying text says: Size: 28.6/25.4 Adapter that enables you to make your steering tube longer Does not effect the function of the Ahead system Compatible with threaded and threadless headsets Comes with a lightweight alloy BBB Roundhead head cap Has anyone used one of these? Will it work for what I need? I'm thinking I'd have to remove the star nut and place this inside the steer tube. The expansion wedge at the bottom would connect it solidly to the steer tube. I'd then have to set the bearings by pulling up on it, or maybe the star nut would then go inside the extension tube? Anyway, for $12, I might just buy one and try it, but I was wondering if anyone was familiar with this thing. Thanks in advance. |
#5
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Threadless steer tube extender
Camilo writes; There are also two extenders that appear to be available. I'm familiar with the ones that clamp onto the steer tube and extend upward: http://tinyurl.com/27pr46 Michael Baldwin wrote: The above is the one you want. Can that type be chopped down to a desired length similar to a fork's steerer tube? It's seems that it could, but I've no experience with these. -- Paul M. Hobson ..:change the f to ph to reply:. |
#6
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Threadless steer tube extender
On Sat, 1 Mar 2008 18:47:51 -0800 (PST), Camilo
may have said: My road bike has a 1 1/8 threadless carbon fork w/ integrated headset, metal steer tube. I have a 90mm 7 degree stem and the reach seems about right. (I've tried 80 and 100). I'd like to get a little more height for the handle bars - I'm only looking for 1/2 - 1 inch (~2 cm). I've tried stem flipped up and down - there is a tiny difference, but not major. My options are to get a higher angled stem or a steer tube extender. Oh, I guess I could buy a new fork, but I'm not going to. There are also two extenders that appear to be available. I'm familiar with the ones that clamp onto the steer tube and extend upward: http://tinyurl.com/27pr46 I recently found a completely different style: http://tinyurl.com/2gbeaz. Basically, instead of clamping around the exterior of the head tube as the other kind does, this one has an internal expansion plug (I guess it's similar to a quill stem?). The accompanying text says: Size: 28.6/25.4 Adapter that enables you to make your steering tube longer Does not effect the function of the Ahead system Compatible with threaded and threadless headsets Comes with a lightweight alloy BBB Roundhead head cap Has anyone used one of these? Will it work for what I need? Maybe. If your steerer is steel, there's a good chance that the ID is compatible with that item. If your steerer is aluminum, all bets are off. That's not the only problem, though... I'm thinking I'd have to remove the star nut and place this inside the steer tube. Yup. The expansion wedge at the bottom would connect it solidly to the steer tube. With some potential caveats. If the wedge grips in the vicinity of the upper bearing of the headset, you could end up distorting the steerer enough to make the headset inner race oval instead of round. This is not very likely, but not outside the realm of possibility. This device also mkaes it a trifle less certain that you'll be able to get the headset correctly loaded; if you use it, I recommend getting a seatpost binder of the appropriate ID, filing off the lip inside (if it has one), and installing that as a clamp immediately above the upper bearing instead of relying solely on the shim stack and the stem to do the job. (Keep the shims installed, though; belt and suspenders is safer than either alone.) I'd then have to set the bearings by pulling up on it, or maybe the star nut would then go inside the extension tube? If it uses a star nut inside, you have problems getting to the binder bolt for the expansion wedge. Anyway, for $12, I might just buy one and try it, but I was wondering if anyone was familiar with this thing. I have something similar around here somewhere as a problem solver...but I haven't had to leave it installed on a bike yet. I've also seem an extender that slips over the steerer and clamps in place like a stem. If you need more than two inches of added rise, they can be useful. -- My email address is antispammed; pull WEEDS if replying via e-mail. Typoes are not a bug, they're a feature. Words processed in a facility that contains nuts. |
#7
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Threadless steer tube extender
Camilo wrote:
I recently found a completely different style: http://tinyurl.com/2gbeaz. Basically, instead of clamping around the exterior of the head tube as the other kind does, this one has an internal expansion plug (I guess it's similar to a quill stem?). Anyway, for $12, I might just buy one and try it, but I was wondering if anyone was familiar with this thing. I've used something similar. It worked fine. I don't know if they make any provision for setting the headset preload, but you can always do it by just pressing down on the stem. |
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