What is the correct nomenclature for this type of stem wedge nut?
02-23-23, 06:38 PM
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What is the correct nomenclature for this type of stem wedge nut?
So... what is the bestest nomenclature/description for a conical shaped stem wedge nut like this one shown (see red arrow)? I'm having difficulties explaining or describing it. Anyone know where to purchase such a thing? Thanks...
02-23-23, 06:50 PM
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Expander bolt cone?
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02-23-23, 06:52 PM
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1987 Crest Cannondale, 1987 Basso Gap, 1992 Rossin Performance EL, 1990ish Van Tuyl, 1985 Trek 670, 1982 AD SLE, 2003 Pinarello Surprise, 1990ish MBK Atlantique, 1987 Peugeot Competition, 1987 Nishiki Tri-A, 1981 Faggin, 1996 Cannondale M500, 1984 Mercian, 1982 AD SuperLeicht, 1985 Massi (model unknown), 1988 Daccordi Griffe , 1989 Fauxsin MTB, 1981 Ciocc Mockba, 1992 Bianchi Giro, 1977 Colnago Super
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02-23-23, 09:15 PM
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Also says it's for 22.2 stem, but it would work equally well on a 22.0 (French) or 21.1 (0.833" American style) stem, so the 22.2 is pointless and a little misleading.
I call it stem quill expander cone, but I'm open to any other terms that get the idea across (unless you call it a wedge, grrr...)
Mark B
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02-23-23, 09:23 PM
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Funny, seller calls it alu, but I'll bet a dollar it is steel. He calls it a wedge, but I reserve that word for the other type of quill. You know, the ones that are wedge-shaped?
Also says it's for 22.2 stem, but it would work equally well on a 22.0 (French) or 21.1 (0.833" American style) stem, so the 22.2 is pointless and a little misleading.
I call it stem quill expander cone, but I'm open to any other terms that get the idea across (unless you call it a wedge, grrr...)
Mark B
Also says it's for 22.2 stem, but it would work equally well on a 22.0 (French) or 21.1 (0.833" American style) stem, so the 22.2 is pointless and a little misleading.
I call it stem quill expander cone, but I'm open to any other terms that get the idea across (unless you call it a wedge, grrr...)
Mark B
On the other hand, an aluminum cone seems like a recipe for stuck-age.
Dave
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02-23-23, 09:31 PM
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conical wedge?
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02-23-23, 09:40 PM
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Cinelli did produce both steel and alloy expanders, as well as stem bolts (I agree with @bulgie that the one in the photo looks steel).
Pic stolen from current Ebay auction:
DD
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02-23-23, 10:22 PM
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Not sure about "correct", but -
conical expander nut for bicycle quill stem
- does pretty well on Duck Duck Go. Still gets a lot of wedges, though.
conical expander nut for bicycle quill stem
- does pretty well on Duck Duck Go. Still gets a lot of wedges, though.
02-23-23, 11:35 PM
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Wedge vs expander
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02-24-23, 04:50 PM
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IMO any of those names beats hell out of "metal right circular conic frustum with central threaded hole."
Last edited by Hondo6; 02-24-23 at 05:07 PM.
02-24-23, 04:57 PM
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Shimano calls it an expander cone.
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02-24-23, 07:14 PM
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02-25-23, 01:52 AM
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Didn't, actually. Constructed that technical description using terms mostly from solid geometry:
frustum - portion of a solid between two parallel planes
right frustum - right pyramid or cone truncated by planes perpendicular to its axis
circular - specifies conic vice pyramidal (probably could have omitted either "circular" or "conical", but using both ensures the reader understands it's round vice polygonal)
metal, central threaded hole - descriptive and reasonably self-explanatory (though I probably should have specified that the central threaded hole was centered on the right frustum's axis)
frustum - portion of a solid between two parallel planes
right frustum - right pyramid or cone truncated by planes perpendicular to its axis
circular - specifies conic vice pyramidal (probably could have omitted either "circular" or "conical", but using both ensures the reader understands it's round vice polygonal)
metal, central threaded hole - descriptive and reasonably self-explanatory (though I probably should have specified that the central threaded hole was centered on the right frustum's axis)
Last edited by Hondo6; 02-25-23 at 05:42 AM.
02-25-23, 03:27 AM
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Why would an aluminum cone cause a stuck stem?. As far as I can see, the only thing it will be in contact with is the inner part of the stem, which I assume to be aluminium. So aluminum to aluminum contact. If I was worried by this (I´ve never thought about it before this post), I´d say steel cone to steel stems, and aluminum cones to aluminum stems.
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02-25-23, 06:19 AM
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02-25-23, 12:33 PM
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on a 22.0 (French) or 21.1 (0.833" American style) stem
Sorry to go off topic briefly, but this interests me. And it's still about stems. My 84 Schwinn LeTour Luxe has a smaller than normal stem. I had always thought it was 0.833. Can anyone confirm this? I have only an analog caliper, and am in the process of making arrangements for Lasik eye surgery (I can't see for ****, even with glasses). TIA
Sorry to go off topic briefly, but this interests me. And it's still about stems. My 84 Schwinn LeTour Luxe has a smaller than normal stem. I had always thought it was 0.833. Can anyone confirm this? I have only an analog caliper, and am in the process of making arrangements for Lasik eye surgery (I can't see for ****, even with glasses). TIA
Last edited by seedsbelize2; 02-25-23 at 12:37 PM.
02-25-23, 01:41 PM
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Perhaps an unusual location for anti-seize compound?
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02-25-23, 01:55 PM
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02-25-23, 01:58 PM
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Over torquing causing the stem tines to dig into the soft expander cone, is what I was thinking.
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02-25-23, 02:08 PM
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02-25-23, 02:29 PM
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I was going to suggest "dinglehopper," it's not complicated enough to be a turboencabulator
It's not a standard fastener, I think. I did look and saw some fasteners that are conical but the function was like a regular nut and the reason was tamper resistant - you couldn't get a vise grips to hang onto it
It's not a standard fastener, I think. I did look and saw some fasteners that are conical but the function was like a regular nut and the reason was tamper resistant - you couldn't get a vise grips to hang onto it
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02-25-23, 03:55 PM
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Exactly! We want it to 'seize' to a certain extent in that location - if it's loosey-goosey, a trip to the emergency room looms...
DD
DD
02-25-23, 04:10 PM
#24
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Quill - The hollow stem-like main shaft of a feather.
A quill-shaped stem and expander can be used on a bicycle.
Conical - resembling a cone especially in shape
A conical expander can also be used on a stem on a bicycle, though a conical expander is actually a truncated cone.
A quill-shaped stem and expander can be used on a bicycle.
Conical - resembling a cone especially in shape
A conical expander can also be used on a stem on a bicycle, though a conical expander is actually a truncated cone.
Last edited by Bad Lag; 02-25-23 at 04:34 PM.
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02-25-23, 05:35 PM
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on a 22.0 (French) or 21.1 (0.833" American style) stem
Sorry to go off topic briefly, but this interests me. And it's still about stems. My 84 Schwinn LeTour Luxe has a smaller than normal stem. I had always thought it was 0.833. Can anyone confirm this? I have only an analog caliper, and am in the process of making arrangements for Lasik eye surgery (I can't see for ****, even with glasses). TIA
Sorry to go off topic briefly, but this interests me. And it's still about stems. My 84 Schwinn LeTour Luxe has a smaller than normal stem. I had always thought it was 0.833. Can anyone confirm this? I have only an analog caliper, and am in the process of making arrangements for Lasik eye surgery (I can't see for ****, even with glasses). TIA
Last edited by uncle uncle; 02-25-23 at 06:17 PM.