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Magnesium bike?

Old 10-30-14, 06:32 PM
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Deontologist
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Magnesium bike?

Paketa magnesium road bike 55cm

Is 1000 a lot for this bike?
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Old 10-30-14, 07:02 PM
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I am not at all knowledgeable about magnesium or the brand, but $1,000 seems awfully high for a dinged 8 year old bike with 105.
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Old 10-30-14, 07:07 PM
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That baby is priceless.....

If you find yourself lost in the woods needing a good fire starter.
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Old 10-30-14, 07:39 PM
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Ever drop magnesium in water in chemistry class at school? I don't think a bike made of magnesium is a good idea.
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Old 10-30-14, 07:49 PM
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I think they're mostly aluminum, but I'm not a materials expert by any means.
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Old 10-30-14, 08:09 PM
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Originally Posted by KonAaron Snake View Post
........ $1,000 seems awfully high for a dinged 8 year old bike with 105.
+1 My feelings exactly.
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Old 10-30-14, 09:05 PM
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The Paketa website says the material is "92% magnesium, alloyed with other metals to achieve optimal mechanical properties while facilitating the extrusion and welding processes."

In his series "Metallurgy for Cyclists" written in the 1990s, Scot Nicol (founder of Ibis) had this to say about magnesium as a frame material.

Originally Posted by Scot Nicol
Magnesium

Imagine a metal with half the density of aluminum, strength better than 6061, and elongation around 10 to 11 percent. I'm describing a magnesium alloy here, currently being tested by Easton. While magnesium is not normally known for its ductility, Easton says the material looks promising with those 10 to 11 percent elongation numbers. Although the modulus is low, in the range of 6MSI, that really shouldn't be an insurmountable problem. Aluminum has a relatively low modulus, but it doesn't mean an aluminum frame can't be built stiff. The same will hold true for magnesium, in fact a lower modulus would be welcome in the eyes of many.

One issue that needs to be addressed with this metal is the extreme problem with corrosion. Leave a magnesium part out in the rain and it will disappear faster than just about anything except unpainted steel. This problem can be overcome with proper surface treatment, like painting or anodization.

One of the intangible benefits of magnesium is that if you need to start a fire for some reason, just scrape some flakes off your dropouts, and light them up. They'll easily burn. For the mini- Hindenburg effect, just add water. The oxygen and hydrogen in the water disassociate, and party down with help from the magnesium. By the way, titanium does the same thing, but it's a little harder to get it started.
I think I'd pass.
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Old 10-31-14, 08:26 AM
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This is likely the best known of the bikes marketed as a Magnesium frame, but I think lots of bikes were built with some kind of magnesium alloyed tubes. I always assumed Bianchis mangalloy stays had some percentage of magnesium in them. Wonder how many more times I can get magnesium in this reply to a post about magnesium?

I do agree the bike the OP links to is way over priced. It is likely only rare because that is the only one the seller has ever seen out in Hooterville.

Kirk Precision. These were a cast magnesium (one more) and were targeted at the TriGeek market in the late '80s.

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Old 10-31-14, 09:47 AM
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I am impressed that they found a way to weld even a magnesium alloy. It has been done, I know. Mercedes at LeMans comes to mind and the Porsche 917/30 allegedly had a magnesium sub frame which no one would admit to because of the LeMans Crash that had the Mercedes fly into the grand stand to horrific results.
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Old 10-31-14, 09:55 AM
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Pinarello Dogmas were magnesium up until the 2009 model year, except for the carbon seatstay and fork. In 2010 the Dogma went all carbon.

$5500 MSRP if you'd like to buy one NOS. Most distributors have marked them down to $4500 now.

Not saying a Paketa is a Dogma, but Magnesium is difficult & expensive to work with. That's why you don't see many of them, and [my guess] no more new production into the future.
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Old 10-31-14, 10:22 PM
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Originally Posted by krobinson103 View Post
Ever drop magnesium in water in chemistry class at school? I don't think a bike made of magnesium is a good idea.
Uhmmm.......I think it is sodium that explodes when dropped into H2O......
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Old 10-31-14, 11:04 PM
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Originally Posted by repechage View Post
I am impressed that they found a way to weld even a magnesium alloy. It has been done, I know. Mercedes at LeMans comes to mind and the Porsche 917/30 allegedly had a magnesium sub frame which no one would admit to because of the LeMans Crash that had the Mercedes fly into the grand stand to horrific results.
Same here. I was all set to accuse them of just using "Magnesium" as a model name until I looked them up. I suppose if they can build millions of VW engine cases out of magnesium alloys, why not bicycle tubes?
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Old 11-01-14, 05:35 AM
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Originally Posted by KonAaron Snake View Post
I am not at all knowledgeable about magnesium or the brand, but $1,000 seems awfully high for a dinged 8 year old bike with 105.
+1. And for a no name bike it makes it even less the deal.

I owned one of the magnesium Pinarello Dogmas and it's an amazing bike. Crazy fast, very smooth riding, top notch in almost every way. Almost, it seemed to have premature BB shell corrosion from water/sweat collecting where the FD cable wrapped around the BB shell...it was heavy. When I bought it has already been ridden heavily by the previous owner, my guesstimate is that it had upwards of 50,000 miles on the clock.

For $1000-1200 there are a lot of nice name brand bikes out there....wait until the weeks before Christmas.
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Old 11-03-14, 09:44 AM
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Originally Posted by Bianchigirll View Post
This is likely the best known of the bikes marketed as a Magnesium frame, but I think lots of bikes were built with some kind of magnesium alloyed tubes. I always assumed Bianchis mangalloy stays had some percentage of magnesium in them.
The 'mang' in mangalloy comes from manganese.
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Old 11-04-14, 10:33 AM
  #15  
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Originally Posted by Paramount1973 View Post
The 'mang' in mangalloy comes from manganese.
Not bad considering I am not 'smithy' nor trained in the arts of metallurgy!!
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Old 11-04-14, 12:09 PM
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Originally Posted by Bianchigirll View Post
Not bad considering I am not 'smithy' not trained in the arts of metallurgy!!
You were close! It was certainly a logical deduction. I collect and use antique woodworking tools and one typically ends up reading some stuff about metallurgy in pursuit of this hobby.
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Old 11-04-14, 12:37 PM
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Originally Posted by krobinson103 View Post
Ever drop magnesium in water in chemistry class at school? I don't think a bike made of magnesium is a good idea.
Will never forget the moment. Such a spectacular mini fireworks display right in the science class sink. Mag wheels became aluminum for the hotrodders.
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Old 11-04-14, 01:21 PM
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Well since no one else posted it. Personally I don't think the bike looks all that expensive, check out that seat post binder bolt.

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Old 01-10-21, 06:31 PM
  #19  
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Originally Posted by miamijim View Post
+1. And for a no name bike it makes it even less the deal.

I owned one of the magnesium Pinarello Dogmas and it's an amazing bike. Crazy fast, very smooth riding, top notch in almost every way. Almost, it seemed to have premature BB shell corrosion from water/sweat collecting where the FD cable wrapped around the BB shell...it was heavy. When I bought it has already been ridden heavily by the previous owner, my guesstimate is that it had upwards of 50,000 miles on the clock.

For $1000-1200 there are a lot of nice name brand bikes out there....wait until the weeks before Christmas.
I have a magnesium Pinarello, AK61 and LOVE the ride it gives!!
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Old 01-19-21, 03:05 PM
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nice
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Old 01-21-21, 03:09 PM
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Cool stories bro's
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