Jeremy I agree with your explanation of the 'creaking' of sleeved bars. Measuring a B177 & B132 & a 1988 Sakae Road Champion, the sleeve is about 1.0mm, probably slightly thicker to provide a sleeve ID < Bar OD for an interference fit to the bar. I imagine the sleeve is heated and then placed on the bar, and the bar is then bent.
I agree there is no reason to doubt the integrity of the sleeve/bar and would not avoid using a sleeved bar. John Hawrylak Woodstown NJ On Tuesday, June 23, 2020 at 11:38:04 AM UTC-4, Jeremy Till wrote: > > I think the mechanical explanation with the sleeve would be that the joint > between the sleeve and bar is not uniform for the length of the sleeve and > thus there is some portion where it is not tight, so the sleeve and bar can > move ever so slightly in relation to one another under stress, producing a > creaking sound. To be honest I'm not familiar with the manufacturing > methods, whether the sleeve is crimped into place or bonded or both. But it > seems reasonable that either way there was some small area, probably near > the ends of the sleeve, where small movements might be possible. That would > explain why people have been successful in addressing the creak by either > dripping lubricant or adhesive (loctite or similar) into the sleeve/bar > joint. That it was able to penetrate at all suggests there might looser > areas and that lubricating the two surfaces or adhering them to reduce > movement suggests that small displacements in these areas would be the > cause of the noise. > > Again, I still trust the quality of Nitto products and the small amount of > creaking I've experienced doesn't make me fear that my bar or stem is going > to fail. > > -Jeremy Till > Sacramento, CA > > On Saturday, June 20, 2020 at 7:18:29 PM UTC-7, John Hawrylak wrote: >> >> Leah >> >> When you install the bolt & triangular nut, can you post a picture of the >> "shelf" without any bolt or nut present?? If the shelf shows no signs of >> missing metal where the hex bolt contacted it, then the hole for the bolt >> was drilled lower than it should have been drilled. This is a possible >> source of the less than adequate tightening of the stem clamp >> >> I still do not see a mechanistic explanation of why the sleeve on the bar >> is a source of the ticking noise. I have used a B177 (Noddle) and a B132 >> (radonnuer) in 225mm quill technomics without any sounds. >> >> Without an explanation, other than it happened to others, I would be >> weary of ruling out use of sleeved bars. >> >> John Hawrylak >> Woodstown NJ. >> >> >> On Saturday, June 20, 2020 at 7:03:04 PM UTC-4, Bicycle Belle Ding Ding! >> wrote: >>> >>> Yes, Jeremy, I think I’m doing 52 steel Boscos on the Platypus. I don’t >>> want bars with sleeves anymore. >>> >>> For anyone who needs to know: If you want to rid the Technomic stem of >>> the hex nut and replace it with the triangular nut from Riv, make sure you >>> also order the bolt. Neither Mark nor I thought I’d need the bolt, but you >>> do, because the threads are different from one another. Get both bolt and >>> stem. I just placed my order for the bolt, so hopefully it comes in a few >>> days and this is the end of the matter! >>> >>> Leah >>> >>> Sent from my iPad >>> >>> > On Jun 20, 2020, at 1:05 PM, Jeremy Till <jerem...@gmail.com> wrote: >>> > >>> > I can't say that I've read every post in the thread but just to echo >>> something Benz said: in my experience creaking is endemic with all of the >>> various sleeved Nitto bars, so if the bar in question is of the sleeved >>> variety that's probably the culprit in my mind. If I remember correctly the >>> sleeved aluminum Boscos that I rode from 2014-2016 creaked, and those were >>> clamped in a 4 bolt removable faceplate threadless stem of the appropriate >>> size, so one of the most solid bar/stem connections out there. The M151 >>> drop bars i currently have on my Rambouillet with a Technomic Deluxe creak >>> when I pedal out of the saddle. I've always just lived with it because it >>> didn't really bother me and didn't seem to get worse or otherwise make me >>> feel like something was about to fail. YMMV, of course, but if avoiding the >>> creak was a priority and the other solutions suggested didn't work, I'd >>> consider going back to the steel Boscos (which I assume weren't sleeved) or >>> other non sleeved bars. >>> > >>> > -Jeremy Till >>> > Sacramento, CA >>> > >>> > -- >>> > You received this message because you are subscribed to a topic in the >>> Google Groups "RBW Owners Bunch" group. >>> > To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/rbw-owners-bunch/FHIW1F5qAE0/unsubscribe. >>> >>> > To unsubscribe from this group and all its topics, send an email to >>> rbw-owne...@googlegroups.com. >>> > To view this discussion on the web visit >>> https://groups.google.com/d/msgid/rbw-owners-bunch/5810a77d-9bd6-40a3-be80-d14f6244aaaeo%40googlegroups.com. >>> >>> >>> >> -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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