Why buy a bike made of 6061 alloy?

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Why buy a bike made of 6061 alloy?
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Posted: Oct 21, 2009 at 3:20 Quote
I've noticed a lot of bikes are made with 6061 alloy, I know it is weaker than 7005 alloy. So I ask, if your paying good dollars, why would you pick this alloy?

Posted: Oct 21, 2009 at 4:35 Quote
Its easier to weld. 7010 Ali needs something like 1% scandium to be weldable, and scandium is only found in Scandinavia. I guess its the same for all 7000 series aluminium. It may be weaker but its cheaper and easier to work with, which means more bikes per day. At least thats what i think, and i could be way off the mark.

Posted: Oct 21, 2009 at 4:56 Quote
if i'm right i think 6061 is also easier to heattreat and hydroform

Posted: Oct 21, 2009 at 5:46 Quote
Fact 1: A 6061 tubeset will be cheaper than a 7005 tubeset from the same manufacturer.

Fact 2: A 6061 tubeset is more adversely affected by the heat of welding than a 7005 tubeset.

Fact 3: A 6061 FRAME maker reduces the weakening effects of welding with a relatively expensive heat treatment process (and perhaps a better welding protocol), whereas a 7005 frame maker uses a more expensive tubeset to minimize the effects of welding with a less expensive heat treatment.

Opinion: Whether a particular 6061 frame is stronger (more resistant to crack propogation and therefore worth more) than an equivalent 7005 frame depends a LOT on the skill and expertise of the builder.

Posted: Oct 23, 2009 at 13:29 Quote
Right... I didn't wnat to get into the actual frame design thing but from what I've read here it's mainly a manufacturing and cost thing. It seems to be a lot of variables also in construction I've never owned a 6061 bike because I was informed from the start that 7005 was stronger. I do know that T6 ing 7005 is an expensive and time consuming process also. I've googled it but I've never found the actual numbers. Does anyone have a head to head strength comparison on the two of them? I know they use like gigapascals or something to measure it but yeah don't know the exact difference in material strength.

Posted: May 21, 2015 at 8:27 Quote

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