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Old 10-22-05, 09:29 AM   #1
Andeli
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Aluminium 6061 vs Alu 7005

Anybody knows the differnce between Alu 6061 and Alu 7005? I want to buy a new bike and have two choices with different frame? which one is better?

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Old 10-22-05, 10:22 AM   #2
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In terms of weldability, tensile and yield strengths, the two are about the same. Check it out here.

The numbers just refer to what sort of materials are alloyed into the Aluminum. 6000-series is Silicon and Copper, I think, and 7000- is Magnesium, Zinc and chromium. Because the numers are so similar, I'd focus more on craftsmanship, like how carefully the frames were welded, and which tubes in the frame are butted. Best advice is to take a test ride and see which bike you like best.
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Old 10-22-05, 11:19 AM   #3
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Also fatigue-resistance on 7005 is about twice as long as 6061. Tougher to weld than 6061, but doesn't require post-weld heat-treatment. As cosmo said, the material itself doesnt make that much of a difference compared to the actual design of the bike such as tubing-diameters, thicknesses, shapes, etc.
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Old 10-22-05, 12:42 PM   #4
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The difference is 944 - but you already knew that right?
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Old 10-26-05, 02:07 AM   #5
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Quote:
Originally Posted by Andeli
Anybody knows the differnce between Alu 6061 and Alu 7005? I want to buy a new bike and have two choices with different frame? which one is better?
My new training bike is a 7005 and I'm really impressed, comeing back from a run last Sunday and was thinking 'I'm flying up the last hill, glad I'm on the Colnago' looked down and of course .....
I'd go for the 7005 every time.
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