#1
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light metal
Today there was a guy with a kid bike and the
saddle post was stuck in the pipe. He said it was because the frame was of "lättmetal", which is literally "light metal" but Google translate gives "alloy". To me it looked like aluminium but then again I haven't seen anything. Is there anything known as "light metal" in the bike frame world that I've missed? And did it get stuck because of some issue related to the material? Anyway we were able to solve their problem by first flushing with CRC 5-56/WD-40, then putting a pipe inside the saddle post, then the whole thing (the bike upside down) into a vice, and then rotating the entire bike it came loose easily. So we got the saddle a bit higher and the dad was very content and very impressed by the whole operation for some reason. The daughter tested the bike and said it was great, only the saddle was too high! -- underground experts united http://user.it.uu.se/~embe8573 |
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#2
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light metal
On 4/22/2018 8:43 AM, Emanuel Berg wrote:
Today there was a guy with a kid bike and the saddle post was stuck in the pipe. He said it was because the frame was of "lättmetal", which is literally "light metal" but Google translate gives "alloy". To me it looked like aluminium but then again I haven't seen anything. Is there anything known as "light metal" in the bike frame world that I've missed? And did it get stuck because of some issue related to the material? Anyway we were able to solve their problem by first flushing with CRC 5-56/WD-40, then putting a pipe inside the saddle post, then the whole thing (the bike upside down) into a vice, and then rotating the entire bike it came loose easily. So we got the saddle a bit higher and the dad was very content and very impressed by the whole operation for some reason. The daughter tested the bike and said it was great, only the saddle was too high! problem: http://www.preservationscience.com/m...etals/PGC.html amelioration (which is not actually a solution but very effective): http://www.antiseize.com/Anti-Seize-Compounds -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#3
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light metal
On 4/22/2018 11:19 AM, AMuzi wrote:
On 4/22/2018 8:43 AM, Emanuel Berg wrote: Today there was a guy with a kid bike and the saddle post was stuck in the pipe. He said it was because the frame was of "lättmetal", which is literally "light metal" but Google translate gives "alloy". To me it looked like aluminium but then again I haven't seen anything. Is there anything known as "light metal" in the bike frame world that I've missed? It almost certainly was an aluminum alloy. In English, the technical definition of "alloy" is a combination of metals, or in some cases including a bit of a non-metal like carbon. But in English bicycling slang, "alloy" often refers to aluminum alloys. A bit more detail: Pure aluminum isn't useful for bike parts or anything else requiring strength. It's light, but quite soft and weak. But if you add a couple percent copper, zinc, or other metals to aluminum, you can get aluminum alloys whose strength to weight ratio is better than common steels. That's what lots of bike components are made of. Steel is an alloy of iron plus carbon and small amounts of other metals. Titanium alloys exist and are occasionally used in some unusual bike parts. Brass is a copper alloy, and I suppose you might find it in some bicycle bells. But again, in the bicycle world if a part is described as made of "alloy" it's generally an aluminum alloy. -- - Frank Krygowski |
#4
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light metal
Frank Krygowski wrote:
Today there was a guy with a kid bike and the saddle post was stuck in the pipe. He said it was because the frame was of "lättmetal", which is literally "light metal" but Google translate gives "alloy". To me it looked like aluminium but then again I haven't seen anything. Is there anything known as "light metal" in the bike frame world that I've missed? It almost certainly was an aluminum alloy. In English, the technical definition of "alloy" is a combination of metals, or in some cases including a bit of a non-metal like carbon. But in English bicycling slang, "alloy" often refers to aluminum alloys. A bit more detail: Pure aluminum isn't useful for bike parts or anything else requiring strength. It's light, but quite soft and weak. But if you add a couple percent copper, zinc, or other metals to aluminum, you can get aluminum alloys whose strength to weight ratio is better than common steels. That's what lots of bike components are made of. Steel is an alloy of iron plus carbon and small amounts of other metals. Titanium alloys exist and are occasionally used in some unusual bike parts. Brass is a copper alloy, and I suppose you might find it in some bicycle bells. But again, in the bicycle world if a part is described as made of "alloy" it's generally an aluminum alloy. OK, thanks for answers, makes sense to me. BTW that shouldn't be "I haven't seen anything", it should be EVERYTHING of course. Hypoxia. -- underground experts united http://user.it.uu.se/~embe8573 |
#5
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light metal
On Sun, 22 Apr 2018 15:43:26 +0200, Emanuel Berg
wrote: Today there was a guy with a kid bike and the saddle post was stuck in the pipe. He said it was because the frame was of "lättmetal", which is literally "light metal" but Google translate gives "alloy". To me it looked like aluminium but then again I haven't seen anything. Is there anything known as "light metal" in the bike frame world that I've missed? And did it get stuck because of some issue related to the material? Anyway we were able to solve their problem by first flushing with CRC 5-56/WD-40, then putting a pipe inside the saddle post, then the whole thing (the bike upside down) into a vice, and then rotating the entire bike it came loose easily. So we got the saddle a bit higher and the dad was very content and very impressed by the whole operation for some reason. The daughter tested the bike and said it was great, only the saddle was too high! Aluminum alloys corrode at amazing rates if in contact with another metal, particularly in the presence of water which provides an electrolyte. Aluminum seat tubes in steel frames, for example. The partial solution is to use a good antisieze, or even grease, to insulate the parts. |
#6
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light metal
On 23/04/18 10:48, John B Slocomb wrote:
Aluminum alloys corrode at amazing rates if in contact with another metal, particularly in the presence of water which provides an electrolyte. Aluminum seat tubes in steel frames, for example. The partial solution is to use a good antisieze, or even grease, to insulate the parts. But beware of greasing when there are carbon fibre parts involved. http://forums.roadbikereview.com/com...sts-40455.html -- JS |
#7
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light metal
On Mon, 23 Apr 2018 13:30:56 +1000, James
wrote: On 23/04/18 10:48, John B Slocomb wrote: Aluminum alloys corrode at amazing rates if in contact with another metal, particularly in the presence of water which provides an electrolyte. Aluminum seat tubes in steel frames, for example. The partial solution is to use a good antisieze, or even grease, to insulate the parts. But beware of greasing when there are carbon fibre parts involved. http://forums.roadbikereview.com/com...sts-40455.html Actually I have a carbon fiber seat post. Bought it at some swap meet and never used it :-( -- Cheers, John B. |
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