Perry McKenna wrote:
...(the new Lance Armstrong) says that aluminum is only good for 5
years. ...
> They also informed me that steel, will also weaken after about five
> years
...> Does anyone know the facts?
The rec.bicycles.tech archives (http://groups.google.com) will lead you
to heaps of facts and arguments. But no consensus.
Metallurgists state that steel is elastic - it can be flexed infinitely
within its safe load without weakening. Aluminum isn't and does fatigue
even with safe load.
However, bicycle frames are not simply steel welded to steel. Some
brazing to lugs and some TIG welding may indeed weaken. However, many
steel frames are just as rigid after 25 years.
YMMV, etc. "Don't worry, ride bike"
Henry Troup
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