Magnesium?

Quoted message said:

The stem is the Jesus-nut of a bicycle.

Off topic, I know, but that one's going in my quote book...

--
Mark Shroyer
http://markshroyer.com/

On Sat, 30 Jun 2007 17:57:46 -0400, [email hidden]

(It's Chris) said:

I don't think anyone has come up with a mag alloy that can offer the
specs needed for a bicycle frame; Stiffness, strength, fatigue
resistance, etc. but I could be mistaken.

Another shoot from the hip answer, but I don't think that's the issue.
They do some great things with magnesium. But, cost is very high.
That's the reason "mag wheels" are no longer made from magnesium
alloys, but from inferior aluminum alloys that weigh more and bend too
easily (bending being a solvable issue).

Quoted message said:

Remember also, if the pro
racers don't like it, it doesn't really matter what suits the rest of
us.

Agreed :-)

Quoted message said:

Besides, carbon fiber is lighter, does meet the requirements and is much
easier to manufacture. I don't think we will be seeing to many new
exotic alloys anytime soon, the current direction is composites. I'm
suprised they haven't started with boron fiber yet.

I think you need to combine this factor with the "trend" factor above.
Carbon fiber is in vogue. Oh, so trendy!

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I was under the impression that it wasn't used in frames more because
it is difficult (expensive) to work with and this means a very limited
market that is more or less dominated by carbon fiber for the
lightweight segment. I'm looking at a used Pinarello Dogma. I like the
sound of it because I want lightweight but I am concerned about the
lack of stiffness in lightweight carbon frames in large sizes with
lots of weight and (hopefully) lots of power. Do you think a magnesium
frame would have a high likelihood of cracking? Which would be worse
for a 200lb+ guy: a lightweight carbon frame or a lightweight
magnesium frame?

Both are worse.

Greg
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email hidden said:

DirtRoadie said:

On Jun 30, 7:49 am, D'ohBoy <[email hidden]> wrote:

Quoted message said:

Quoted message said:

Frames have been made - Paketa, others... Stems as well. Don't know
if still in production.

Quoted message said:

Fork sliders are typically magnesium.
Off the top of my head, other examples of magnesium bike parts have
included brake parts (levers, v-brake arms) and even wheel rims.http://www.amclassic.com/magnesium_clincher.html

Quoted message said:

DR

I am in particular considering a welded magnesium frame, and a cnc-'d
magnesium stem. I wonder what the pitfalls of using magnesium for
these components is, and if there is any particular reason I should
avoid them. I am interested in them for the light weight and strength,
but if they are susceptible to breakage particularly from my weight
I'll give them a pass.

Joseph

Take a close look at what they are actually made of and you will see a
relatively small amount of the material is actually Mg..it is mostly
aluminum.