Mountain Biking - 6061,7051.......what?

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shaun16
07-02-03, 10:13 AM
ok, on aluminium frames i notice that there are numbers like 6061 and other numbers. what do these numbers mean?? my bike says 6061 on it. is this good or bad??

thanks

schnell
07-02-03, 10:21 AM
Different alloys are created with different elements. 7000 uses zinc as a primary element, 6000 uses magnesium. Both are equally stiff, but 7000 has a slightly higher yield strength.
a2psyklnut
07-02-03, 10:21 AM
It's the grade of tubing. i.e. 7006 grade aluminum vs 7076....I'm not metalurgist, so I can't tell you anymore than that!

L8R

shaun16
07-02-03, 10:30 AM
thanks you two :)
Bobatin
07-02-03, 11:11 AM
try Eastons web site. http://www.eastonbike.com/tubesets_top.html
nick1111
07-02-03, 12:46 PM
http://www.brucescycleworks.com/tips/tip18.html

as you can see 2014-T6 is the strongest out there. Too bad it's almost impossible to weld at this point
TimB
07-02-03, 03:27 PM
Yes thats the stuf that Bridgestone made their RADAC aluminium bikes from. Glued together though. Nice bikes!
That said, the numbers on the tubing merely states the class of alloy that was used. Even though 7000 series onaverage has a higher yield strength, it' the design of the frame thats more important. Cannondale still uses 6000 series because it's eaier to manipulate into different shapes and wall thickness.
Their Optimo tubing is a scandium enhanced 6000 series alloy.