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Old Feb 3rd, 2009, 9:09 pm   #1 (permalink)
sps
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Magnesium or Aluminum?

How do you tell the difference between magnesium and aluminum Marchesini 5 spokes?
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Old Feb 3rd, 2009, 9:48 pm   #2 (permalink)
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You may not be able to tell by look. There would be a weight difference though. The magnesium would be lighter of course. I am sure that this is not the answer you were looking for, but the only one I can think of
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Old Feb 3rd, 2009, 10:16 pm   #3 (permalink)
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Overall Magnesium is the lightest material besides carbon for wheels. If you want to save weight go with magnesium. If you just want a different look, save money and do alum.
Just pick them up! LOL
I think the only real way to tell if there were no label would be to look at the unpainted part of the wheel(inside hub) and you should be able to tell pretty easy.
Magnesium has a goldish metallic color
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Old Feb 3rd, 2009, 10:20 pm   #4 (permalink)
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Magnesium is actually flammable so take a blow torch to them and the ones that catch fire and potentially explode are the magnesium

Sorry, I couldn't help myself.
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Old Feb 3rd, 2009, 10:25 pm   #5 (permalink)
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Old Feb 3rd, 2009, 10:28 pm   #6 (permalink)
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I believe that the Mag rims and the Alu rims differ on the spokes. The Mag are smooth, similar to the Marvic finish (the marvic are more round though), and the Alu have a line running down the spokes. Look at my rear rim in the photo, you can see the smooth that I am talking about. Then look at this 996's March and you will see the line I am talking about. That is how it was explained to me when I was trying to figure out if I had Mag rims on this puppy when I purchased it.

<---No line

<---See the line
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Old Feb 3rd, 2009, 11:46 pm   #7 (permalink)
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You should just know when you lift a mag wheel. If it feels lighter than you expected, it's magnesium.
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Old Feb 3rd, 2009, 11:52 pm   #8 (permalink)
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Quote:
Originally Posted by DucatiScotty View Post
You should just know when you lift a mag wheel. If it feels lighter than you expected, it's magnesium.
That is true, but I was speaking from the physical appearence. Also I did not know anyone else with a Duc, had never had any other wheel, and was not at a point where I was disassembling anything from my bike, even the rear wheel. Now is a different story, and picking up the rim is so effortless, I know without ever touching an Aluminum rim the difference. Not everyone has access a variety of parts so that they can do side by side comparisons
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Old Feb 4th, 2009, 2:18 am   #9 (permalink)
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Simple the magnesium wheel will have white corrosion powder coming out from the bubbling and lifting paint!

Sorry! as above, I could help myself either. I'm forever repairing corrosion of magnesium aircraft components at work.
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Old Feb 4th, 2009, 2:25 am   #10 (permalink)
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Quote:
Originally Posted by jwsparkes View Post
Simple the magnesium wheel will have white corrosion powder coming out from the bubbling and lifting paint!

Sorry! as above, I could help myself either. I'm forever repairing corrosion of magnesium aircraft components at work.
Ahhhh. You speak of "bloom".
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