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Why aren't there magnesium bikes?(13 posts)

Why aren't there magnesium bikes?mk_42
Oct 2, 2001 4:26 PM
I've heard this mentioned in passing but no one has ever answered this question well. Does anybody know for real why there are no Magnesium bikes?
I work in a dynamics test facility and we use a LOT of magnesium so this question bugs me every day. It's easy to machine, and easy to weld. It's light, it's stiff, and can be made so it dampens high frequency (like carbon fiber). It's stiffness to weight ratio is better than steel, aluminum, or titanium? So why doesn't anybody use it? It seems like you could get a really light bike out of it.

What gives?

It would melt in the rainLC
Oct 2, 2001 5:20 PM
Ever take a peice of magnesium and throw it into the water?

It reacts very violently...smoke and peices of metal flying everywhere. Used to sneak some out of the lab and throw it into a pond and watch the fireworks.
It would melt in the rainnatz
Oct 3, 2001 5:36 AM
I believe this is the answer to the question "Why aren't there potassium bikes?".
re: Why aren't there magnesium bikes?Largo
Oct 2, 2001 5:36 PM
In a word, its relatively weak, although it does have a high strength to weight ratio.
Also, it has poor fatigue resistance, as well as poor corrosion resistance.
Bell Huey helicopters used to used Mg tail boom sections, but the military found that the tail sections would corrode so badly during the course of transport to Vietnam, that Mg got ditched pretty quickly.
Mag 21 Rock Shox's used in a maritime climate demonstrate this very nicely.
Mg is mostly used where light weight and stiffness, not strength is the primary concern.
re: Why aren't there magnesium bikes?mackgoo
Oct 2, 2001 5:46 PM
Actually there are. There was a guy that used to post alot of adds for mag. frames.
What, nobody remembers the Kirk?cory
Oct 2, 2001 5:54 PM
There was a mag frame bike called the Kirk, about 12 years ago. Really cool-looking, I think cast rather than made from tubing (sounds weird, but I think I remember reading that). I found a picture online a couple of years ago for some project my daughter was doing on new uses of materials, but can't remember where.
Was that the frame that looked like a truss bridge? -NMTig
Oct 3, 2001 9:12 AM
there iscyclopathic
Oct 2, 2001 7:27 PM
MGlitech makes MTB and road frames out of magnesium
not sold in US but I can get one
there is morePeter E
Oct 2, 2001 11:02 PM
Merida also does both have a road-bike and a mountainbike, and they have been given good credit.
i know that The Merida MTB-team uses the mg-frame and i think that the road-frame also is used in competitions.

But i dont know if Merida exsits in the US
See more at
"Don't know if Merida exists in the US"TJeanloz
Oct 3, 2001 10:13 AM
They do. We call them Specialized. Actually, Merida is one of the Big Three asian bike factories (Hodakka, and Giant being the other two). They own 49% of Specialized as of Spring 2001. They make many of the asian super-aluminum bikes that we have seen a flood of lately.
Specialized exsits here alsoPeter E
Oct 4, 2001 2:43 AM
We also have Specialized in Europe. Didn't know that Spec and Merida was so close connected but there both wonderful bikes and have geometries that's a bit simular.
re: Why aren't there magnesium bikes?old timer
Oct 6, 2001 8:46 PM
Back in the eighties a company called Kirk made cast magnesium frames in the UK. Supposedly they were made from the magnesium in sea water.
gone are the days...
re: Why aren't there magnesium bikes?pacificRim
Oct 9, 2001 8:21 PM
Out here on Guam there are a few guys with both road and mtn. magnesium frames. They can be purchased thro a local company.The frames are from mglitech ,I think from Russia- Budapest.So far I've heard great stuff on the frames,I'm pondering on getting one myself.