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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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I'll just throw out some engineering/materials perspective.
Carbon-Fiber can provide the highest stiffness per weight.
Steel can provide the highest strength per weight. (you could bend it in half and it still won't break)
Ti, and Al, will give some great yield-strength per weight. (and corrosion resistance)
The BIG player, in frame stiffness, comes from the geometry of the frame and tubes.
So, for example, if a CF frame is too bouncey, the designer was likely set on making the bike hyper-light, and didn't give the enough though to the structure . . . and with CF frame manufacturing methods, the best structure can be tough to get. (as with other materials)
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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