I just got some bikes in with the NVO adjustable stem. For those unaquainted as I was prior to receiving these, it consists of a keyed sleeve that fits over the steer tube (threadless, of course) and an oversize stem which slips over it and the cap. The advantages appear to be, adjustability without messing with spacers and bearing adjustment, and the ability to remove the stem, again without disrupting headset adjustment. Disadvantages are, um, well, can't seem to think of any. I just know someone out there is going to tell me it is an answer to an un-asked question, but I am interested to know if there is a downside to them I overlooked. Dan
David L. Johnson 6 March 2006 07:59:57 [ permanent link ]
On Mon, 06 Mar 2006 12:30:41 +1100, Dan Burkhart wrote:
I just got some bikes in with the NVO adjustable stem. For those> unaquainted as I was prior to receiving these, it consists of a keyed> sleeve that fits over the steer tube (threadless, of course) and an> oversize stem which slips over it and the cap. The advantages appear to> be, adjustability without messing with spacers and bearing adjustment,> and the ability to remove the stem, again without disrupting headset> adjustment.
Gee, that sounds almost like a quill stem for a threaded headset. Amazing innovation.
--
David L. Johnson
__o | Some people used to claim that, if enough monkeys sat in front _`\(,_ | of enough typewriters and typed long enough, eventually one of (_)/ (_) | them would reproduce the collected works of Shakespeare. The internet has proven this not to be the case.
Dan Burkhart wrote:> I just got some bikes in with the NVO adjustable stem. For those> unaquainted as I was prior to receiving these, it consists of a keyed> sleeve that fits over the steer tube (threadless, of course) and an> oversize stem which slips over it and the cap. The advantages appear to> be, adjustability without messing with spacers and bearing adjustment,> and the ability to remove the stem, again without disrupting headset> adjustment. Disadvantages are, um, well, can't seem to think of any.> I just know someone out there is going to tell me it is an answer to> an un-asked question, but I am interested to know if there is a> downside to them I overlooked.
Most adjustable threadless stems are quite massive, twice as heavy as the heaviest non-adjustable model. (I am unfamiliar with the NVO brand) -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971
On Mon, 06 Mar 2006 00:16:46 -0600, A Muzi <am@yellowjersey.org> wrote:
Most adjustable threadless stems are quite massive, twice as >heavy as the heaviest non-adjustable model. (I am unfamiliar >with the NVO brand)
It's a slightly modified oversize conventional threadless stem that rides on a split sleeve that is held down by the usual threadless stem top cap. The stem can then be loosened and moved vertically without taking the tension off the headset. The setup is apparently patented, but I believe the patent is only violated if the keyway feature is copied; it appears to me that the key usefulness of this concept could easily be duplicated via the use of a 1 1/4" stem and a split sleeve that was 1.127" ID, 1.248" OD, and the length of the protruding steerer plus 6mm or so. The key slot and ridge which keeps the sleeve's split aligned with the clamp's gap is a good feature, but not essential if the installer understands and pays attention to the necessity of manually aligning the split and the clamp gap. (In fact, with a little lube, this issue might not even be all that essential, but I'd prefer a dry interface, in which case the alignment seems advisable.) -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts.
On Wed, 8 Mar 2006 11:19:04 +1100, Dan Burkhart <Dan.Burkhart.24bren@no-mx.forums.cyclingforums.com> wrote:
I havn't measured it, but it looks more like 35mm of>adjustability,(just as a guess, and I am not looking at it right now)
The point I was making with the "1mm of adjustment" statement is that to try to fine-tune a shimmed stem's height that closely is a bit on the silly side; shims generally don't come in sizes that would make it easy. With this product installed, however, any increment within the total range becomes possible with ease.
I have known people who would have been so obsessive about getting that height "just right" that they'd have been visiting me within a week of purchase to have the clamp bolt threads helicoiled. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts.
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