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Carbon and steel/titanium/alum bonds(3 posts)

Carbon and steel/titanium/alum bondsHomer
Mar 22, 2001 8:11 PM
Hi there.

Now that steel/ti/al bikes with carbon fiber seat stays are getting more common by the day, how do they really rate up in durability?

Does the bond fail since it's essentially "glued" with precised dimensions?

Will the different expand/bending of the 2 different material cause
the bond to suffer?
re: Carbon and steel/titanium/alum bondsSnake Bites
Mar 23, 2001 5:51 AM
Hey Homer.....do you ride a carbon fork with Al dropouts, AL crown and Steel or AL steerer? Consider all the bonds in one of them.........Scary isn't it??
the "glue" is pretty strong - aerospace industry stuffJon(unregistered)
Mar 23, 2001 7:44 AM
And you've got to think that after years of R&D, they'd get it right. The only thing I'd worry about is the aluminum to carbon bonds - if not properly insulated from each other, the electrolytic potential between the materials corrodes the aluminum, causing debonding and failure. Most companies bonding these two materials together use a wrap of fiberglass or a special layer of resin between them for this purpose.
Bonding steel or titanium with carbon does not have this risk, but steel is seen as heavier, and titanium raises cost, so aluminum is far more popular.