Originally Posted by
cyccommute
Steel is always more rigid than aluminum. That's why they make springs out of the stuff
That and steel has an infinite fatigue life below it's yield point, aluminium does not.
Titanium alloys also have infinite fatigue life but are much more moola and not as stiff or strong as good steel in direct tension size for size, but its lighter, so more can be used, this is why Ti spokes never really caught on(bigger=less aerodynamic).