Originally Posted by
JohnDThompson
Even steel is an alloy, and except for some early "commercially pure" titanium bike frames from the 1970s, even titanium frames will be an alloy of some sort.
You can distinguish steel frames from aluminum or titanium alloy frames with a magnet. Beyond that, it gets trickier. Photos may help.
Can't say I've ever heard anyone refer to a steel bike as an alloy bike. And 99.99999% of the time in the bicycle industry "alloy" means aluminum.
A fuji pro is hydroformed aluminum alloy.
The fuji feather is steel.